Luc Castaignos

{{Short description|Dutch footballer (born 1992)}}

{{Use dmy dates|date=January 2022}}

{{Infobox football biography

| name = Luc Castaignos

| image = Luc Castaignos 2011 (cropped).jpg

| upright =

| caption = Castaignos with Feyenoord in 2011

| full_name = Luc Castaignos{{cite web |url=https://www.fifadata.com/document/FU17/2009/pdf/FU17_2009_SquadLists.pdf |title=FIFA U-17 World Cup Nigeria 2009: List of Players: Netherlands |publisher=FIFA |page=16 |date=17 November 2009 |archive-url=https://web.archive.org/web/20191202094605/https://www.fifadata.com/document/FU17/2009/pdf/FU17_2009_SquadLists.pdf |archive-date=2 December 2019}}

| birth_date = {{birth date and age|1992|9|27|df=y}}

| birth_place = Schiedam, Netherlands

| height = 1.87 m

| position = Forward

| currentclub =

| clubnumber =

| youthyears1 = 1997–2006

| youthclubs1 = Excelsior '20

| youthyears2 = 2006–2007

| youthclubs2 = Spartaan '20

| youthyears3 = 2007–2009

| youthclubs3 = Feyenoord

| years1 = 2009–2011

| clubs1 = Feyenoord

| caps1 = 42

| goals1 = 15

| years2 = 2011–2012

| clubs2 = Inter Milan

| years3 = 2012–2015

| caps2 = 8

| goals2 = 1

| clubs3 = Twente

| caps3 = 114

| goals3 = 42

| years4 = 2015–2016

| clubs4 = Eintracht Frankfurt

| caps4 = 22

| goals4 = 5

| years5 = 2016–2019

| clubs5 = Sporting CP

| caps5 = 17

| goals5 = 0

| years6 = 2017–2018

| clubs6 = → Vitesse (loan)

| caps6 = 36

| goals6 = 3

| years7 = 2019–2020

| clubs7 = Gyeongnam

| caps7 = 34

| goals7 = 6

| years8 = 2021–2022

| clubs8 = OFI

| caps8 = 20

| goals8 = 1

| years9 = 2023–2024

| clubs9 = 1. FC Magdeburg

| caps9 = 26

| goals9 = 5

| nationalyears1 = 2008–2009

| nationalteam1 = Netherlands U17

| nationalcaps1 = 17

| nationalgoals1 = 13

| nationalyears2 = 2010–2011

| nationalteam2 = Netherlands U19

| nationalcaps2 = 17

| nationalgoals2 = 8

| nationalyears3 = 2012

| nationalteam3 = Netherlands U20

| nationalcaps3 = 1

| nationalgoals3 = 0

| nationalyears4 = 2011–2014

| nationalteam4 = Netherlands U21

| nationalcaps4 = 15

| nationalgoals4 = 6

| club-update = 22 May 2024

| nationalteam-update =

}}

Luc Castaignos (born 27 September 1992) is a Dutch professional footballer who plays as a forward.

{{TOC limit|3}}

Club career

=Early career=

The roots of Castaignos' family are located in the département of Landes, one hundred kilometers south of Bordeaux in the south-west of France.{{cite news |title= Castaignos: voetbaltiener in de glazen kooi|url=http://www.ad.nl/ad/nl/1429/Feyenoord/article/detail/432927/2009/09/26/Castaignos-voetbaltiener-in-de-glazen-kooi.dhtml|newspaper=Algemeen Dagblad|language=nl|trans-title=Castaignos: football teenager in glass cage|date=26 September 2009|access-date=26 September 2009|archiveurl=https://web.archive.org/web/20090928234601/http://www.ad.nl/ad/nl/1429/Feyenoord/article/detail/432927/2009/09/26/Castaignos-voetbaltiener-in-de-glazen-kooi.dhtml|archive-date=28 September 2009|url-status=dead}} There, Castaignos' father, the French-born Jean-Luc Castaignos, met Castaignos' mother who is of Cape Verdean descent and holder of an Italian passport.{{cite news|title=Die Wuchtbrumme|url=https://www.fr.de/eintracht-frankfurt/wuchtbrumme-11189989.html|publisher=Frankfurter Rundschau|language=de|date=17 November 2015|access-date=5 June 2021}}{{cite news|title=Castaignos im Wartestand|url=https://www.fr.de/eintracht-frankfurt/castaignos-wartestand-11120888.html|publisher=Frankfurter Rundschau|language=de|date=26 March 2016|access-date=5 June 2021}} In October 1990, two years before Luc's birth, the family moved to the Netherlands.

Castaignos started his youth career at the local Schiedam club Excelsior '20.{{cite news|title=Transfer Castaignos lucratief voor Excelsior '20|url=https://www.rijnmond.nl/nieuws/91643/Transfer-Castaignos-lucratief-voor-Excelsior-20|publisher=RTV Rijnmond|language=nl|date=3 August 2012|access-date=5 June 2021}} The youngster lived close to Sportpark Thurlede, the home ground of the Catholic club. His former Excelsior '20 coach, Paul Benschop, was soon convinced by Castaignos' quality: "Everyone could see how much potential he had. Whenever we conceded a goal, Luc would take care of business."{{cite news|title=Tienerster moet Feyenoord gaan redden|url=http://www.depers.nl/sport/315170/Tienerster-moet-Feyenoord-redden.html|newspaper=De Pers|language=nl|trans-title=Teenage star to go save Feyenoord|date=26 June 2009|access-date=26 September 2009|url-status=dead|archive-url=https://web.archive.org/web/20090620063739/http://www.depers.nl/sport/315170/Tienerster-moet-Feyenoord-redden.html|archive-date=20 June 2009}} At the age of 13, he participated on regional club Spartaan '20's opening day. The club from Rotterdam, youth partner of Feyenoord, saw plenty of potential in the youngster and invited him to join. Castaignos only played one season for Spartaan '20. When various professional clubs showed their interest, Spartaan '20 warned Feyenoord. At the age of 14, he joined the Feyenoord Academy in the summer of 2007. On 30 October 2008, Castaignos signed his first professional contract with Feyenoord, keeping him at De Kuip until summer 2011 with an option for another two seasons.{{cite news|title=Luc Castaignos tekent eerste profcontract|url=http://www.feyenoord.nl/pages/newsdetail/S2/20081030_castaignos.aspx|newspaper=Feyenoord.nl|language=nl|trans-title=Luc Castaignos signs first professional contract|date=30 October 2008|access-date=26 September 2009|archiveurl=https://web.archive.org/web/20120223230815/http://www.feyenoord.nl/pages/newsdetail/S2/20081030_castaignos.aspx|archive-date=23 February 2012|url-status=dead}} He then progressed through the academy.{{cite web|url=http://www.feyenoord.nl/pages/newsdetail/s1/10010000034117-999-10010000000003.aspx|title=FEYENOORD B1 PAKT LANDSTITEL|publisher=Feyenoord|language=nl|date=25 April 2009|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20090428161620/http://www.feyenoord.nl/pages/newsdetail/s1/10010000034117-999-10010000000003.aspx|archive-date=28 April 2009|url-status=dead}}
{{cite news|title=Feyenoord-jeugd pakt Super Cup|url=https://www.rijnmond.nl/nieuws/22768/Feyenoord-jeugd-pakt-Super-Cup|publisher=RTV Rijnmond|language=nl|date=15 September 2009|access-date=5 June 2021}}
{{cite news|title=FEYENOORD A1 DANKT CASTAIGNOS|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/4486/feyenoord-a1-dankt-castaignos|publisher=Ons Oranje|language=nl|date=24 April 2010|access-date=5 June 2021}}

=Feyenoord=

File:Luc Castaignos crop.jpg in 2011]]

After a successful performance with the Netherlands U17 at the 2009 UEFA European Under-17 Football Championship, a clutch of sides were linked to the Dutch youngster. Besides Arsenal, also Liverpool, Manchester United, Real Madrid, Inter Milan, Bayern Munich and TSG 1899 Hoffenheim showed their interest in the Feyenoord's top scorer.{{cite news|title=Liverpool volgt jeugdspeler Castaignos|url=https://www.rijnmond.nl/nieuws/25468/Liverpool-volgt-jeugdspeler-Castaignos|publisher=RTV Rijnmond|language=nl|date=24 May 2009|access-date=5 June 2021}}
{{cite web|url=http://www.telegraaf.nl/telesport/voetbal/4023506/__Castaignos_goudmijntje_Feyenoord__.html|title=Castaignos goudmijntje Feyenoord|work=De Telegraaf|language=nl|date=28 May 2009|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20090530124213/http://www.telegraaf.nl:80/telesport/voetbal/4023506/__Castaignos_goudmijntje_Feyenoord__.html|archive-date=30 May 2009|url-status=dead}}
{{cite web|url=http://www.sportweek.nl/voetbal/99068/Arsenal_wil_Feyenoorder_Luc_Castaignos|title= Arsenal wil Feyenoorder Luc Castaignos|publisher=Sportweek|language=nl|date=9 June 2009|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20100113113701/http://www.sportweek.nl/voetbal/99068/Arsenal_wil_Feyenoorder_Luc_Castaignos|archive-date=13 January 2010|url-status=dead}}
{{cite news|title=Optie in Feyenoord-contract Castaignos dubieus|url=https://www.fcupdate.nl/voetbalnieuws/122244/optie-in-feyenoord-contract-castaignos-dubieus/|publisher=FC Update|language=nl|date=13 June 2009|access-date=5 June 2021}}
{{cite news|title=Real wil speler Feyenoord-jeugd|url=http://www.telegraaf.nl/telesport/voetbal/4161748/__Real_wil_speler_Feyenoord-jeugd__.html|newspaper=De Telegraaf|language=nl|trans-title=Real wants player Feyenoord youth|date=15 June 2009|access-date=26 September 2009|archiveurl=https://web.archive.org/web/20090617030033/http://www.telegraaf.nl/telesport/voetbal/4161748/__Real_wil_speler_Feyenoord-jeugd__.html|archive-date=17 June 2009|url-status=dead}}
However, on 22 July 2009, Castaignos crushed all rumours and told Feyenoord manager Mario Been and technical advisor Leo Beenhakker that he wanted to stay in Rotterdam.{{cite news|title=Castaignos blijft Feyenoorder|url=http://www.telegraaf.nl/telesport/voetbal/4452084/__Castaignos_blijft_Feyenoorder__.html|newspaper=De Telegraaf|language=nl|trans-title=Castaignos remains Feyenoorder|date=22 July 2009|access-date=26 September 2009|archiveurl=https://web.archive.org/web/20090725202602/http://www.telegraaf.nl/telesport/voetbal/4452084/__Castaignos_blijft_Feyenoorder__.html|archive-date=25 July 2009|url-status=dead}}
{{cite news|title=Castaignos blijft bij Feyenoord|url=https://www.rijnmond.nl/nieuws/24094/Castaignos-blijft-bij-Feyenoord|publisher=RTV Rijnmond|language=nl|date=22 July 2009|access-date=5 June 2021}}
On 21 June 2009, Been announced he invited Castaignos to train with the first team squad a few times a week.{{cite news |title=Been gaat Castaignos al kans geven|url=http://www.ad.nl/ad/nl/1016/Nederlands-voetbal/article/detail/418096/2009/06/21/Been-gaat-Castaignos-al-kans-geven.dhtml|newspaper=Algemeen Dagblad|language=nl|trans-title=Been already to give Castaignos chance|date=21 June 2009|access-date=28 September 2009|archiveurl=https://web.archive.org/web/20090624015714/http://www.sportwereld.nl/voetbal/clubdossiers/feyenoord/3308705/Been_gaat_Castaignos_al_kans_geven.html|archive-date=24 June 2009|url-status=dead}} On 13 August 2009, he trained with the first team squad for the first time.{{cite news |title=Luc Castaignos traint voor eerste maal met selectie mee|url=http://www.feyenoord.nl/pages/newsdetail/S2/20090813_castaignos.aspx|newspaper=Feyenoord.nl|language=nl|trans-title=Luc Castaignos trains with the first team for the first time|date=13 August 2009|access-date=26 September 2009|archive-url=https://web.archive.org/web/20120308064814/http://www.feyenoord.nl/pages/newsdetail/S2/20090813_castaignos.aspx|archive-date=8 March 2012|url-status=dead }} Castaignos made his official debut in Feyenoord's first team on 24 September 2009 replacing Leroy Fer in the 72nd minute in the KNVB Cup away match against Harkemase Boys and helped the club win 5–0.{{cite news|title=Feyenoord boekt onberispelijke zege in Friesland|url=http://www.feyenoord.nl/pages/datapresenter/S2/10010000000002-10010000000016/wedstrijdinfo.aspx?contentcode=matchinfo&dataid=10010000034816|newspaper=Feyenoord.nl|language=nl|trans-title=Flawless victory for Feyenoord in Friesland|date=24 September 2009|access-date=26 September 2009|url-status=dead|archive-url=https://web.archive.org/web/20110928025718/http://www.feyenoord.nl/pages/datapresenter/S2/10010000000002-10010000000016/wedstrijdinfo.aspx?contentcode=matchinfo&dataid=10010000034816 |archive-date=28 September 2011}} After making his first team debut for Feyenoord, he said: "It's strange, because I haven't really proven anything yet. My strengths are my speed and scoring ability, the heading and my left leg could be even better. I can learn a lot from a player like Roy Makaay. Now and then I ask for advice, but I mainly look at the training at which moments he walks away and so on. My debut is a first step, but there are still many steps to follow."{{cite web|url=http://www.telegraaf.nl/telesport/voetbal/4919228/__Castaignos__Heb_nog_niets_bewezen__.html|title=Castaignos: Ik heb nog niets bewezen|work=De Telegraaf|language=nl|date=25 September 2009|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20090928075929/http://www.telegraaf.nl/telesport/voetbal/4919228/__Castaignos__Heb_nog_niets_bewezen__.html|archive-date=28 September 2009|url-status=dead}}
{{cite news|title=Castaignos: "Invalbeurt slechts een klein stapje"|url=https://www.fcupdate.nl/voetbalnieuws/129310/castaignos-invalbeurt-slechts-een-klein-stapje/|publisher=FC Update|language=nl|date=25 September 2009|access-date=5 June 2021}}
At one point, due to his lack of first team opportunities, Castaignos was expected to be loaned out to SBV Excelsior but he ended up staying at the club due to his latter injury.{{cite news|title=Castaignos vervangt Slory in wedstrijdselectie Feyenoord|url=https://www.rijnmond.nl/nieuws/20994/Castaignos-vervangt-Slory-in-wedstrijdselectie-Feyenoord|publisher=RTV Rijnmond|language=nl|date=22 November 2009|access-date=5 June 2021}}
{{cite news|title=Mario Been kondigt wijzigingen in de basis aan|url=https://feyenoord.supporters.nl/nieuws/artikel/20491/Mario-Been-kondigt-wijzigingen-in-de-basis-aan|publisher=Feyenoord Supporters News|language=nl|date=21 December 2009|access-date=5 June 2021}}
{{cite news|title=Erwin Mulder blijft bij Feyenoord|url=https://www.rijnmond.nl/nieuws/20227/Erwin-Mulder-blijft-bij-Feyenoord|publisher=RTV Rijnmond|language=nl|date=18 December 2009|access-date=5 June 2021}}
{{cite news|title=Castaignos door operatie niet mee naar Belek|url=https://www.fcupdate.nl/voetbalnieuws/136319/castaignos-door-operatie-niet-mee-naar-belek/|publisher=FC Update|language=nl|date=7 January 2010|access-date=5 June 2021}}
{{cite web|url=http://www.feyenoord.nl/pages/newsdetail/S1/10010000035754-999-10010000000003.aspx|title=Eerste basisplaats voor De Vrij in eredivisie|publisher=Feyenoord|language=nl|date=12 January 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20100125011132/http://www.feyenoord.nl/pages/newsdetail/S1/10010000035754-999-10010000000003.aspx|archive-date=25 January 2010|url-status=dead}}
Five months later after making his first team debut and being on the unused bench, Castaignos made his debut, coming on for Jon Dahl Tomasson in a 3–2 loss against Groningen on 28 February 2010.{{cite web|url=http://www.feyenoord.nl/pages/newsdetail/s1/10010000035958-999-10010000000003.aspx|title=Been: 'We moeten winnen, zo simpel is het'|publisher=Feyenoord|language=nl|date=19 February 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20100222045857/http://www.feyenoord.nl/pages/newsdetail/s1/10010000035958-999-10010000000003.aspx|archive-date=22 February 2010|url-status=dead}}
{{cite news|title=Makaay in basis tegen Groningen|url=https://www.rijnmond.nl/nieuws/18423/Makaay-in-basis-tegen-Groningen|publisher=RTV Rijnmond|language=nl|date=25 February 2010|access-date=5 June 2021}}
{{cite news|title=Castaignos maakt competitive debuut|url=https://www.rijnmond.nl/nieuws/18359/Castaignos-maakt-competitiedebuut|publisher=RTV Rijnmond|language=nl|date=28 February 2010|access-date=5 June 2021}}
A month later on 24 March 2010, he made his first start of the season against FC Twente in the second leg of the KNVB Cup semi–finals and helped the club win 2–1 to reach the final.{{cite web|url=http://www.feyenoord.nl/pages/newsdetail/s1/10010000036170-999-10010000000003.aspx|title=Castaignos maakt basisdebuut tegen FC Twente|publisher=Feyenoord|language=nl|date=23 March 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20100326020316/http://www.feyenoord.nl/pages/newsdetail/s1/10010000036170-999-10010000000003.aspx|archive-date=26 March 2010|url-status=dead}}
{{cite news|title=Makaay schiet Feyenoord in finale|url=https://www.trouw.nl/nieuws/makaay-schiet-feyenoord-in-finale~bb0d30c5/|publisher=Trouw|language=nl|date=24 March 2010|access-date=5 June 2021}}
Later in the 2009–10 season, Castaignos would make two more appearances and the club would finish in fourth place.{{cite news|title=Feyenoord laat punten liggen in Nijmegen|url=https://www.rijnmond.nl/nieuws/17547/Feyenoord-laat-punten-liggen-in-Nijmegen|publisher=RTV Rijnmond|language=nl|date=28 March 2010|access-date=5 June 2021}}
{{cite news|title=Makaay schiet Feyenoord naar vierde eindpositie|url=https://www.fcupdate.nl/voetbalnieuws/145198/makaay-schiet-feyenoord-naar-vierde-eindpositie/|publisher=FC Update|language=nl|date=2 May 2010|access-date=5 June 2021}}

The 2010–11 season campaign proved to be Castaignos' breakout season, stemming from squad rotation and losses in the transfer market.{{cite web|url=http://www.vi.nl/Nieuws-item/181516/Beenhakker-zet-verhoudingen-in-de-Kuip-op-scherp.htm|title=Beenhakker zet verhoudingen in de Kuip op scherp|publisher=Voetbal International|language=nl|date=26 June 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20100726131714/http://www.vi.nl/Nieuws-item/181516/Beenhakker-zet-verhoudingen-in-de-Kuip-op-scherp.htm|archive-date=26 July 2010|url-status=dead}}
{{cite web|url=http://www.nusport.nl/eredivisie/2279359/castaignos-eerste-keus-in-spits.html|title=Castaignos eerste keus in de spits|publisher=Nu Sport|language=nl|date=27 June 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20100701033704/http://www.nusport.nl/eredivisie/2279359/castaignos-eerste-keus-in-spits.html|archive-date=1 July 2010|url-status=dead}}
{{cite news|title=Castaignos in de spits bij Feyenoord|url=https://www.rijnmond.nl/nieuws/13710/Castaignos-in-de-spits-bij-Feyenoord|publisher=RTV Rijnmond|language=nl|date=22 August 2010|access-date=5 June 2021}}
{{cite news|title=Castaignos krijgt voorlopig het vertrouwen|url=https://www.rijnmond.nl/nieuws/12704/Castaignos-krijgt-voorlopig-het-vertrouwen|publisher=RTV Rijnmond|language=nl|date=25 September 2010|access-date=5 June 2021}}
{{cite web|url=http://www.feyenoord.nl/pages/newsdetail/S1/10010000037493-999-10010000000003.aspx|title=Been houdt tegen Heerenveen vast aan vertrouwde elf|publisher=Feyenoord|language=nl|date=12 November 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20101116125124/http://www.feyenoord.nl/pages/newsdetail/S1/10010000037493-999-10010000000003.aspx|archive-date=16 November 2010|url-status=dead}}
{{cite news|script-title=ru:В бой идет одна молодежь!|url=http://www.sports.ru/tribuna/blogs/younger/132273.html|publisher=Sport Tribune|language=ru|date=26 November 2010|access-date=29 November 2012}} He made his UEFA Europa League debut, coming on as a 77th-minute substitute, in a 1–0 win against Gent in the first leg of the play-off rounds (as Feyenoord went on to lose 2–0 in the return leg and was eliminated from the tournament).{{cite web|url=http://www.feyenoord.nl/pages/datapresenter/s2/10010000000002-10010000000062/wedstrijdinfo.aspx?contentcode=matchinfo&dataid=10010000036980|title=Feyenoord ziet vechtlust beloond tegen Gent|publisher=Feyenoord|language=nl|date=19 August 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20110218102448/http://www.feyenoord.nl/pages/datapresenter/s2/10010000000002-10010000000062/wedstrijdinfo.aspx?contentcode=matchinfo&dataid=10010000036980|archive-date=18 February 2011|url-status=dead}}
{{cite web|url=http://www.feyenoord.nl/pages/datapresenter/s2/10010000000002-10010000000016/wedstrijdinfo.aspx?contentcode=matchinfo&dataid=10010000036981|title=Feyenoord strijdend ten onder in Gent|publisher=Feyenoord|language=nl|date=26 August 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20110218122830/http://www.feyenoord.nl/pages/datapresenter/s2/10010000000002-10010000000016/wedstrijdinfo.aspx?contentcode=matchinfo&dataid=10010000036981|archive-date=18 February 2011|url-status=dead}}
Following the club's elimination in the UEFA Europa League, Castaignos scored his first career goal for Feyenoord, in a 4–0 win against Vitesse on 28 August 2010.{{cite web|url=http://www.feyenoord.nl/pages/datapresenter/s2/10010000000002-10010000000016/wedstrijdinfo.aspx?contentcode=matchinfo&dataid=10010000036614|title=Feyenoord overklast Vitesse in De Kuip|publisher=Feyenoord|language=nl|date=28 August 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20110218123043/http://www.feyenoord.nl/pages/datapresenter/s2/10010000000002-10010000000016/wedstrijdinfo.aspx?contentcode=matchinfo&dataid=10010000036614|archive-date=18 February 2011|url-status=dead}} As a result, the club began talks with the player over a new contract.{{cite news|title=Feyenoord en Fer starten contract besprekingen|url=https://www.fcupdate.nl/voetbalnieuws/156774/feyenoord-en-fer-starten-contractbesprekingen/|publisher=FC Update|language=nl|date=18 September 2010|access-date=5 June 2021}}
{{cite news|title=Feyenoord legt vijf talenten tot 2013 vast|url=https://www.fcupdate.nl/voetbalnieuws/162256/feyenoord-legt-vijf-talenten-tot-2013-vast/|publisher=FC Update|language=nl|date=19 November 2010|access-date=5 June 2021}}
However, he rejected a contract extension, leaving his future at Feyenoord uncertain.{{cite news|title=Castaignos niet akkoord met contractverlenging|url=https://www.fcupdate.nl/voetbalnieuws/162284/castaignos-niet-akkoord-met-contractverlenging/|publisher=FC Update|language=nl|date=10 November 2010|access-date=5 June 2021}}
{{cite news|title=Treffers: "Castaignos wil bij Feyenoord blijven"|url=https://www.fcupdate.nl/voetbalnieuws/162598/treffers-castaignos-wil-bij-feyenoord-blijven/|publisher=FC Update|language=nl|date=23 November 2010|access-date=5 June 2021}}
{{cite news|title=Bosvelt: "Van Beukering kan Castaignos ontlasten"|url=https://www.fcupdate.nl/voetbalnieuws/162800/bosvelt-van-beukering-kan-castaignos-ontlasten/|publisher=FC Update|language=nl|date=25 November 2010|access-date=5 June 2021}}
Amid to the contract rejection, he scored three goals in three matches between 31 October 2010 and 14 November 2010 against AZ Alkmaar, Roda JC and SC Heerenveen.{{cite news|title=Ongelukkige nederlaag Feyenoord bij AZ|url=https://www.rijnmond.nl/nieuws/11557/Ongelukkige-nederlaag-Feyenoord-bij-AZ|publisher=RTV Rijnmond|language=nl|date=31 October 2010|access-date=5 June 2021}}
{{cite news|title=Feyenoord pakt in slotfase punt tegen Roda JC|url=https://www.rijnmond.nl/nieuws/11313/Feyenoord-pakt-in-slotfase-punt-tegen-Roda-JC|publisher=RTV Rijnmond|language=nl|date=7 November 2010|access-date=5 June 2021}}
{{cite news|title=Cabral schiet Feyenoord naar punt|url=https://www.rijnmond.nl/nieuws/11099/Cabral-schiet-Feyenoord-naar-punt|publisher=RTV Rijnmond|language=nl|date=14 November 2010|access-date=5 June 2021}}
{{cite news|title=Luc Castaignos RTV Rijnmond Speler van de Week|url=https://www.rijnmond.nl/nieuws/11098/Luc-Castaignos-RTV-Rijnmond-Speler-van-de-Week|publisher=RTV Rijnmond|language=nl|date=14 November 2010|access-date=5 June 2021}}
Castaignos changed his mind when he signed a contract extension with the club, keeping him until 2013, but his agent disputed the claims that the deal was done.{{cite web|url=http://www.feyenoord.nl/pages/newsdetail.aspx?contentcode=20101119_contract_verlengingen|title=Feyenoord verlengt contracten Castaignos, Cabral, Martins Indi, Leerdam en Isoufi|publisher=Feyenoord|language=nl|date=19 November 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20101123045041/http://www.feyenoord.nl/pages/newsdetail.aspx?contentcode=20101119_contract_verlengingen|archive-date=23 November 2010|url-status=dead}}
{{cite news|title=Castaignos niet zomaar akkoord met contractverlenging|url=https://www.rijnmond.nl/nieuws/10932/Castaignos-niet-zomaar-akkoord-met-contractverlenging|publisher=RTV Rijnmond|language=nl|date=19 November 2010|access-date=5 June 2021}}
{{cite news|title=Feyenoord: Niks mis met contract Castaignos en Martins Indi|url=https://www.rijnmond.nl/nieuws/10913/Feyenoord-Niks-mis-met-contract-Castaignos-en-Martins-Indi|publisher=RTV Rijnmond|language=nl|date=20 November 2010|access-date=5 June 2021}}
Castaignos later scored two more goals by the end of the year, coming against ADO Den Haag on 28 November 2010 and SBV Excelsior on 11 December 2010.{{cite news|title=Castaignos schiet Feyenoord naar zege|url=https://www.rijnmond.nl/nieuws/10667/Castaignos-schiet-Feyenoord-naar-zege|publisher=RTV Rijnmond|language=nl|date=28 November 2010|access-date=5 June 2021}}
{{cite news|title=Feyenoord worstelt zich naar drie punten|url=https://www.fcupdate.nl/voetbalnieuws/164291/feyenoord-worstelt-zich-naar-drie-punten/|publisher=FC Update|language=nl|date=12 December 2010|access-date=5 June 2021}}
{{cite news|title=Castaignos Speler van de Week|url=https://www.rijnmond.nl/nieuws/10221/Castaignos-Speler-van-de-Week|publisher=RTV Rijnmond|language=nl|date=12 December 2010|access-date=5 June 2021}}
In a friendly match against Sparta Rotterdam on 5 January 2011, he received a straight red card in the 57th minute for kicking an opponent, in a 4–2 win.{{cite web|url=https://www.feyenoord.nl/pages/newsdetail.aspx?contentcode=20110105_zilveren_bal_feyenoord|title=Feyenoord bewijst Moulijn sportieve eer|publisher=Feyenoord|language=nl|date=5 January 2011|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20110111152537/https://www.feyenoord.nl/pages/newsdetail.aspx?contentcode=20110105_zilveren_bal_feyenoord|archive-date=11 January 2011|url-status=dead}} After the match, Castaignos was investigated for his actions by the KNVB, but no action was taken against him.{{cite news|title=KNVB start vooronderzoek naar Castaignos|url=https://www.fcupdate.nl/voetbalnieuws/166121/knvb-start-vooronderzoek-naar-castaignos/|publisher=FC Update|language=nl|date=6 January 2011|access-date=5 June 2021}}
{{cite web|url=http://www.telegraaf.nl/telesport/voetbal/feyenoord/8667829/__Castaignos_hoeft_Ajax_niet_te_missen__.html|title=Castaignos hoeft Ajax niet te missen|work=De Telegraaf|language=nl|date=6 January 2011|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20110109032243/http://www.telegraaf.nl/telesport/voetbal/feyenoord/8667829/__Castaignos_hoeft_Ajax_niet_te_missen__.html|archive-date=9 January 2011|url-status=dead}}
{{cite web|url=http://www.nu.nl/sport/2417426/rode-kaart-castaignos-geseponeerd.html|title=Rode kaart Castaignos geseponeerd|publisher=Nu.nl|language=nl|date=7 January 2011|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20110225005342/http://www.nu.nl/sport/2417426/rode-kaart-castaignos-geseponeerd.html|archive-date=25 February 2011|url-status=dead}}
{{cite news|title=CASTAIGNOS HEEFT GELEERD VAN ROOD|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/18718/castaignos-heeft-geleerd-van-rood|publisher=Ons Oranje|language=nl|date=13 January 2011|access-date=5 June 2021}}
During the same month, he suffered ankle injury while training but quickly recovered from the injury.{{cite news|title=Blessure Castaignos valt mee|url=https://www.rijnmond.nl/nieuws/9372/Blessure-Castaignos-valt-mee|publisher=RTV Rijnmond|language=nl|date=14 January 2011|access-date=5 June 2021}}
{{cite news|title=Castaignos hervat training bij Feyenoord|url=https://www.fcupdate.nl/voetbalnieuws/166921/castaignos-hervat-training-bij-feyenoord/|publisher=FC Update|language=nl|date=17 January 2011|access-date=5 June 2021}}
A month later against Vitesse on 6 February 2011, Castaignos scored his seventh goal of the season, in a 1–1 draw.{{cite news|title=Zwaarbevochten punt voor Feyenoord|url=https://www.rijnmond.nl/nieuws/8539/Zwaarbevochten-punt-voor-Feyenoord|publisher=RTV Rijnmond|language=nl|date=6 February 2011|access-date=5 June 2021}} Two weeks later on 20 February 2011, he scored his first brace of his career, in a 2–2 draw against ADO Den Haag.{{cite news|title=Feyenoord geeft overwinning uit handen|url=https://www.rijnmond.nl/nieuws/8045/Feyenoord-geeft-overwinning-uit-handen|publisher=RTV Rijnmond|language=nl|date=20 February 2011|access-date=5 June 2021}}
{{cite news|title=Castaignos: "Dit tekent onze pech dit seizoen"|url=https://www.fcupdate.nl/voetbalnieuws/169824/castaignos-dit-tekent-onze-pech-dit-seizoen/|publisher=FC Update|language=nl|date=21 February 2011|access-date=5 June 2021}}
Two weeks later on 6 March 2011, Castaignos scored his tenth goal of the season, in a 1–0 win against SC Heerenveen.{{cite news|title=Gelukkig Feyenoord wint in Heerenveen|url=https://www.rijnmond.nl/nieuws/7574/Gelukkig-Feyenoord-wint-in-Heerenveen|publisher=RTV Rijnmond|language=nl|date=6 March 2011|access-date=5 June 2021}} This was followed up by scoring his eleventh goal of the season, in a 2–1 win against NAC Breda.{{cite news|title=Feyenoord wint ook van NAC Breda|url=https://www.rijnmond.nl/nieuws/7343/Feyenoord-wint-ook-van-NAC-Breda|publisher=RTV Rijnmond|language=nl|date=13 March 2011|access-date=5 June 2021}} He went on to score four goals in the last four matches of the season that saw Feyenoord finish 10th place in the league, missing out on the Europa League in the process.{{cite news|title=Ruime zege Feyenoord tegen Willem II: 6-1|url=https://www.nrc.nl/nieuws/2011/04/17/ruime-zege-feyenoord-tegen-willem-ii-6-1-a1458075|work=NRC Handelsblad|language=nl|date=17 April 2011|access-date=5 June 2021}}
{{cite news|title= Sterk Feyenoord heelt oude wonden tegen PSV|url=https://www.fcupdate.nl/voetbalnieuws/174628/sterk-feyenoord-heelt-oude-wonden-tegen-psv/|publisher=FC Update|language=nl|date=25 April 2011|access-date=5 June 2021}}
{{cite news|title=VVV-Venlo verrast Feyenoord|url=https://www.trouw.nl/nieuws/vvv-venlo-verrast-feyenoord~ba459f7c/|publisher=Trouw|language=nl|date=1 May 2011|access-date=5 June 2021}}
{{cite news|title=Feyenoord sluit seizoen in stijl af|url=https://www.trouw.nl/nieuws/feyenoord-sluit-seizoen-in-stijl-af~bb0c85d7/|publisher=Trouw|language=Dutch|date=15 May 2011|access-date=5 June 2021}}
At the end of the 2010–11 season, Castaignos went on to make 37 appearances and scoring fifteen times in all competitions. He later said in an interview about his desire on returning to Feyenoord one day.{{cite news|title=Castaignos: "Kampioen worden met Feyenoord"|url=https://www.fcupdate.nl/voetbalnieuws/162741/castaignos-kampioen-worden-met-feyenoord/|publisher=FC Update|language=nl|date=24 November 2010|access-date=5 June 2021}}

=Inter Milan=

As a result of rejecting a new contract with Feyenoord, Castaignos was on the rampant speculation during the January transfer window, with Italian giants Inter Milan, PSV Eindhoven, Tottenham Hotspur and Valencia were interested in signing the player.{{cite news|title=Castaignos schermt met interesse PSV|url=https://www.fcupdate.nl/voetbalnieuws/162307/castaignos-schermt-met-interesse-psv/|publisher=FC Update|language=nl|date=20 November 2010|access-date=5 June 2021}}
{{cite news|title=Inter meldt zich bij Feyenoord voor Castaignos|url=https://www.fcupdate.nl/voetbalnieuws/163188/inter-meldt-zich-bij-feyenoord-voor-castaignos/|publisher=FC Update|language=nl|date=29 November 2010|access-date=5 June 2021}}
{{cite news|title=Beenhakker gaat praten met Internazionale|url=https://www.rijnmond.nl/nieuws/10616/Beenhakker-gaat-praten-met-Internazionale|publisher=RTV Rijnmond|language=nl|date=29 November 2010|access-date=5 June 2021}}
{{cite news|title=Interesse voor Castaignos krijgt serieuze vorm|url=https://www.rijnmond.nl/nieuws/10363/Interesse-voor-Castaignos-krijgt-serieuze-vorm|publisher=RTV Rijnmond|language=nl|date=8 December 2010|access-date=5 June 2021}}
{{cite web|url=http://www.talksport.co.uk/sports-news/football/premier-league/transfer-rumours/3693/2/tottenham-fight-£4million-feyenoord-sensation|title=Tottenham in fight for £4million Feyenoord sensation|publisher=TalkSport|date=14 December 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20101217032915/http://www.talksport.co.uk/sports-news/football/premier-league/transfer-rumours/3693/2/tottenham-fight-%C2%A34million-feyenoord-sensation|archive-date=17 December 2010|url-status=dead}}
In the January transfer window, Inter Milan had their €3 million bid rejected by Feyenoord for Castaignos.{{cite news|title=Feyenoord wijst bod Inter op Castaignos af|url=https://www.fcupdate.nl/voetbalnieuws/167413/feyenoord-wijst-bod-inter-op-castaignos-af/|publisher=FC Update|language=nl|date=23 January 2011|access-date=5 June 2021}} After months of agreement, it was finally announced on 4 March 2011 by Feyenoord that the club had agreed to terms with Inter Milan, selling the player for a fee believed to be around €3 million upon the completions of the 2010–2011 season.{{cite news|title=Inter stelt komst Castaignos uit tot juni|url=https://www.rijnmond.nl/nieuws/8834/Inter-stelt-komst-Castaignos-uit-tot-juni|publisher=RTV Rijnmond|language=nl|date=29 January 2011|access-date=5 June 2021}}
{{cite web|url=http://www.feyenoord.nl/pages/newsdetail.aspx?contentcode=20110131Castaignos|title=Feyenoord en Internazionale zijn het eens over Castaignos|publisher=Feyenoord|language=nl|date=31 January 2011|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20110203034738/http://www.feyenoord.nl/pages/newsdetail.aspx?contentcode=20110131Castaignos|archive-date=3 February 2011|url-status=dead}}
{{cite web|url=https://www.gazzetta.it/Calcio/SerieA/Inter/28-02-2011/inter-ecco-castaignos-80319856910.shtml|title=Inter, ecco Castaignos A Milano per le visite|publisher=La Gazzetta Dello Sport|language=it|date=28 February 2011|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20110301161017/https://www.gazzetta.it/Calcio/SerieA/Inter/28-02-2011/inter-ecco-castaignos-80319856910.shtml|archive-date=1 March 2011|url-status=dead}}
{{cite news|title=Castaignos over Inter: "Knokken om hier te slagen"|url=https://www.fcupdate.nl/voetbalnieuws/170461/castaignos-over-inter-knokken-om-hier-te-slagen/|publisher=FC Update|language=nl|date=1 March 2011|access-date=5 June 2021}}
{{cite web|url=http://www.feyenoord.nl/pages/newsdetail.aspx?contentcode=20110304_inter_castaignos|title=Transfer Castaignos naar Internazionale afgerond|publisher=Feyenoord|language=nl|date=4 March 2011|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20110724152054/http://www.feyenoord.nl/pages/newsdetail.aspx?contentcode=20110304_inter_castaignos|archive-date=24 July 2011|url-status=dead}}
Upon joining the club, he said: "As a striker you always want to score, but I had hoped to say goodbye with European football. The choice for Inter was a choice based on feeling. I hope that I can become a better football player there. Of course I am really looking forward to going in that direction and developing myself as footballer. I want to become a top player."{{cite news|title=Castaignos: "Bij Inter een topspeler worden"|url=https://www.fcupdate.nl/voetbalnieuws/176298/castaignos-bij-inter-een-topspeler-worden/|publisher=FC Update|language=nl|date=16 May 2011|access-date=5 June 2021}}

Castaignos was featured throughout preseason, most notably scoring the opening goal in a friendly against Celtic on 30 July 2011.{{cite web|url=http://www.inter.it/aas/news/reader?N=36802&L=en|title=Trentino Team 1-6 Inter, Gasperini starts with win|publisher=Inter Milan|date=14 July 2011|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20110717170650/http://www.inter.it/aas/news/reader?N=36802&L=en|archive-date=17 July 2011|url-status=dead}}
{{cite web|url=http://www.inter.it/aas/news/reader?N=36973&L=en|title=Dublin Super Cup: Inter beat Celtic 2-0|publisher=Inter Milan|date=30 July 2011|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20121012171221/http://www.inter.it/aas/news/reader?N=36973&L=en |archive-date=12 October 2012|url-status=dead}}
{{cite web|title=Inter vs. Celtic Match Report|url=http://www.goal.com/en/match/63340/celtic-vs-inter-milan/report|publisher=Goal.com|url-status=dead|archive-url=https://web.archive.org/web/20110910222134/http://www.goal.com/en/match/63340/celtic-vs-inter-milan/report|archive-date=10 September 2011}}
He made his competitive debut for Inter Milan in a Supercoppa Italiana, coming on for Joel Obi in a 2–1 loss against Milan, and played in front of 70,000 people at Beijing National Stadium, Beijing China PR.{{cite news|title=Ibra e Boateng stendono l'Inter|url=http://www.repubblica.it/sport/calcio/coppe/2011/08/06/news/milan-inter_la_partita_in_diretta-20104654/|publisher=La Repubblica|language=it|date=6 August 2011|access-date=5 June 2021}} However, Castaignos was controversially dropped from the UEFA Champions League squad.{{cite news|title=LUC CASTAIGNOS NIET IN CL|url=https://www.onsoranje.nl/nieuws/jong-oranje/27510/luc-castaignos-niet-cl|publisher=Ons Oranje|language=nl|date=1 September 2011|access-date=5 June 2021}} This led the club's chairman Massimo Moratti commenting on the situation on the player, saying: "I was very sorry for Castaignos because he is a great guy, if this story came up he would play him. It's pretty bad, but it's not like you hit someone. We just have to avoid these things."{{cite news|title=Moratti e il caso Forlan "Dispiace per Castaignos"|url=http://www.repubblica.it/sport/calcio/serie-a/inter/2011/09/08/news/moratti_su_gasperini-21407666/|publisher=La Repubblica|language=it|date=8 September 2011|access-date=5 June 2021}} Despite hops of his inclusion in the squad for the tournament, Castaignos remained out of the squad.{{cite news|title=TOCH HOOP VOOR CASTAIGNOS|url=https://www.onsoranje.nl/nieuws/jong-oranje/27626/toch-hoop-voor-castaignos|publisher=Ons Oranje|language=nl|date=3 September 2011|access-date=5 June 2021}}
{{cite news|title=CASTAIGNOS DUPE VAN BLUNDER|url=https://www.onsoranje.nl/nieuws/jong-oranje/27886/castaignos-dupe-van-blunder|publisher=Ons Oranje|language=nl|date=9 September 2011|access-date=5 June 2021}}
{{cite news|title=Sneijder una risorsa ma davanti siamo tanti|url=http://www.repubblica.it/sport/calcio/serie-a/inter/2011/09/10/news/gasperini_sneijder-21481632/|publisher=La Repubblica|language=it|date=10 September 2011|access-date=5 June 2021}}
He made his full league debut, starting a match before being substituted at half time, in a 3–1 loss against Novara on 20 September 2011.{{cite news|title=Novara da favola Gasperini, è addio?|url=http://www.repubblica.it/sport/calcio/serie-a/novara/2011/09/20/news/novara_inter_diretta-21966201/|publisher=La Repubblica|language=it|date=20 September 2011|access-date=5 June 2021}} Castaignos then scored his first goal in Serie A in an away match to Siena on 27 November 2011, latching on to Thiago Motta's through ball before firing low past Brkić, which proved to be the game winner.{{cite news|title=Triunfo agónico del Inter en Siena|url=http://www.prensalibre.com/deportes/futbol_internacional/Triunfo-agonico-Inter-Siena_0_598740208.html|publisher=Prensa Libre|language=es|date=27 November 2011|access-date=29 November 2012|url-status=dead|archive-url=https://web.archive.org/web/20111212213354/http://prensalibre.com/deportes/futbol_internacional/Triunfo-agonico-Inter-Siena_0_598740208.html|archive-date=12 December 2011}}
{{cite news|title=Castaignos rilancia l'Inter Il Siena cede nel finale|url=http://www.repubblica.it/sport/calcio/serie-a/siena/2011/11/27/news/siena_inter-25690228/|publisher=La Repubblica|language=it|date=27 November 2011|access-date=5 June 2021}}
{{cite news|title=Castaignos vince la partita che non c' è|url=http://ricerca.repubblica.it/repubblica/archivio/repubblica/2011/11/28/castaignos-vince-la-partita-che-non.html|publisher=La Repubblica|language=it|date=28 November 2011|access-date=5 June 2021}}
However, Castaignos found his first team opportunities limited, due to competitions in the striker positions.{{cite news|title=Ranieri non si arrende "Ci stiamo riprendendo"|url=http://www.repubblica.it/sport/calcio/serie-a/inter/2011/10/29/news/ranieri_juve-24122195|publisher=La Repubblica|language=it|date=29 October 2011|access-date=5 June 2021}}
{{cite news|title=Sneijder trova il problema "Squilibrio titolari-riserve"|url=http://www.repubblica.it/sport/calcio/serie-a/inter/2011/11/10/news/sneijder_riserve_inter_forlan-24798187|publisher=La Repubblica|language=it|date=10 November 2011|access-date=5 June 2021}}
{{cite news|title=CASTAIGNOS MAAKT ZICH NIET DRUK|url=https://www.onsoranje.nl/nieuws/jong-oranje/33530/castaignos-maakt-zich-niet-druk|publisher=Ons Oranje|language=nl|date=7 February 2012|access-date=5 June 2021}}

As a result of his lack of first team opportunities, Castaignos was linked a move away from the club, as European clubs from Italy and his homeland country, including PSV Eindhoven were interested in signing him.{{cite news|title=PSV WILDE CASTAIGNOS HUREN|url=https://www.onsoranje.nl/nieuws/jong-oranje/30030/psv-wilde-castaignos-huren|publisher=Ons Oranje|language=nl|date=2 November 2011|access-date=5 June 2021}}
{{cite news|title= VOLOP INTERESSE VOOR CASTAIGNOS|url=https://www.onsoranje.nl/nieuws/jong-oranje/32294/volop-interesse-voor-castaignos|publisher=Ons Oranje|language=nl|date=31 December 2011|access-date=5 June 2021}}
{{cite news|title=Di Tevez non parlo e Sneijder non parte|url=http://www.repubblica.it/sport/calcio/serie-a/inter/2012/01/06/news/ranieri_mercato_parma-27683229/|publisher=La Repubblica|language=it|date=6 January 2012|access-date=5 June 2021}}
Ultimately, he stayed at Inter Milan after his agent ruled out of suggestions about the player being loaned out.{{cite news|title=CASTAIGNOS WORDT NIET VERHUURD|url=https://www.onsoranje.nl/nieuws/jong-oranje/32318/castaignos-wordt-niet-verhuurd|publisher=Ons Oranje|language=nl|date=2 January 2012|access-date=5 June 2021}} During a 3–0 loss against Bologna on 17 February 2012, Castaignos was involved in altercation with Andrea Raggi after he spat on Raggi in the 85th minute.{{cite news|title=Crolla l'Inter ora è vera crisi|url=http://www.repubblica.it/sport/calcio/serie-a/inter/2012/02/17/news/inter_bologna-30072351/|publisher=La Repubblica|language=it|date=17 February 2012|access-date=5 June 2021}}
{{cite news|title=CASTAIGNOS SPUUGT TEGENSTANDER|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-beloftenelftal/33950/castaignos-spuugt-tegenstander|publisher=Ons Oranje|language=nl|date=18 February 2012|access-date=5 June 2021}}
After the match, Serie A officials reviewed footage of the incident and he was subsequently banned for three matches.{{cite news|title=Sputa sull'avversario, tre turni a Castaignos|url=http://www.corriere.it/sport/12_febbraio_19/castaignos-sputo_170009ac-5aeb-11e1-af48-fbc2e490f6c3.shtml|work=Corriere della Sera|language=it|date=19 February 2012|access-date=29 November 2012}} Even after serving a three match suspension, his actions caused Inter to immediately move him into a reserve role, scoring twice in three appearances for the reserve squad and only playing once in the league.{{cite web|url=https://www.inter.it/it/news/2012/03/10/primavera-col-cesena-finisce-4-2.html|title=PRIMAVERA: COL CESENA FINISCE 4-2|publisher=Inter Milan|language=it|date=10 March 2012|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20210601194907/https://www.inter.it/it/news/2012/03/10/primavera-col-cesena-finisce-4-2.html|archive-date=1 June 2021|url-status=live}}
{{cite web|url=https://www.inter.it/it/news/2012/03/18/inter-atalanta-0-0-reti-inviolate-al-meazza.html|title=INTER-ATALANTA, 0-0: RETI INVIOLATE AL "MEAZZA"|publisher=Inter Milan|language=it|date=18 March 2012|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20210601195612/https://www.inter.it/it/news/2012/03/18/inter-atalanta-0-0-reti-inviolate-al-meazza.html|archive-date=1 June 2021|url-status=live}}
{{cite web|url=https://www.inter.it/it/news/2012/03/31/primavera-e-sconfitta-contro-il-chievo.html|title=PRIMAVERA: È SCONFITTA CONTRO IL CHIEVO|publisher=Inter Milan|language=it|date=31 March 2012|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20210601200307/https://www.inter.it/it/news/2012/03/31/primavera-e-sconfitta-contro-il-chievo.html|archive-date=1 June 2021|url-status=live}}
However, Castaignos then suffered a hamstring injury, missing out for the rest of the season during a match against Padova Primavera on 4 April 2012 and was sidelined for the rest of the 2011–12 season.{{cite web|url=https://www.inter.it/it/news/2012/04/4/primavera-inter-padova-finisce-4-0.html|title=PRIMAVERA: INTER-PADOVA, FINISCE 4-0|publisher=Inter Milan|language=it|date=4 April 2012|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20210601200713/https://www.inter.it/it/news/2012/04/4/primavera-inter-padova-finisce-4-0.html|archive-date=1 June 2021|url-status=live}}
{{cite news|title=Infortunio Castaignos: l'esito degli esami|url=http://www.inter.it/aas/news/reader?N=57412&L=it|publisher=Inter.it|language=it|date=5 April 2012|access-date=29 November 2012|archiveurl=https://web.archive.org/web/20120413112739/http://www.inter.it/aas/news/reader?N=57412&L=it|archive-date=13 April 2012|url-status=dead}}
At the end of the 2011–12 season, he went on to make eight appearances and scoring once in all competitions.

Following this, his future at Inter Milan was uncertain when Castaignos was linked with a move away from the club.{{cite news|title=Castaignos gewilde prooi voor veel clubs|url=https://www.fcupdate.nl/voetbalnieuws/203586/castaignos-gewilde-prooi-voor-veel-clubs/|publisher=FC Update|language=nl|date=24 April 2012|access-date=5 June 2021}} It came after when he was linked with a move to clubs around Premier League clubs, such as, Liverpool, West Ham United, Everton and even his former club, Feyenoord.{{cite news|title=Luc Castaignos chase hots up as Bologna leap frog Liverpool|url=http://metro.co.uk/2012/01/13/luc-castaignos-chase-hots-up-as-bologna-leap-frog-liverpool-283423/|publisher=Metro|date=13 January 2012|access-date=5 June 2021}}
{{cite news|title=Feyenoord eyeing Castaignos|url=http://www1.skysports.com/football/news/11095/7619866/|publisher=Sky Sports|date=23 March 2012|access-date=29 November 2012|archiveurl=https://web.archive.org/web/20130703060848/http://www1.skysports.com/football/news/11095/7619866/|archive-date=3 July 2013|url-status=dead}}
{{cite news|title=CASTAIGNOS GOED ALTERNATIEF|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-beloftenelftal/38038/castaignos-goed-alternatief|publisher=Ons Oranje|language=nl|date=23 May 2012|access-date=5 June 2021}}
{{cite news|title=CASTAIGNOS ZET FEYENOORD UIT ZIJN HOOFD|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-beloftenelftal/39722/castaignos-zet-feyenoord-uit-zijn-hoofd|publisher=Ons Oranje|language=nl|date=19 June 2012|access-date=5 June 2021}}
{{cite news|title=Veel Engelse belangstelling voor Castaignos|url=http://www.fcupdate.nl/voetbalnieuws/209683/veel-engelse-belangstelling-voor-castaignos/|publisher=FC Update|language=nl|date=16 July 2012|access-date=5 June 2021}}
{{cite news|title=Scouse scrap: Liverpool and Everton in for 'the new Thierry Henry'|url=https://www.mirror.co.uk/sport/football/transfer-news/liverpool-fighting-everton-for-luc-castaignos-906506|work=Daily Mirror|date=22 June 2012|access-date=5 June 2021}}
{{cite news|title=CASTAIGNOS HEEFT CLUBS VOOR HET UITKIEZEN|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-beloftenelftal/39802/castaignos-heeft-clubs-voor-het-uitkiezen|publisher=Ons Oranje|language=nl|date=22 June 2012|access-date=5 June 2021}}
On 20 June 2012, Castaignos announced his intention to leave Inter in favor of a 'big club'.{{cite news|title=Castaignos to leave Inter|url=http://www1.skysports.com/football/news/11095/7829653/|publisher=Sky Sports|date=20 June 2012|access-date=29 November 2012|archiveurl=https://web.archive.org/web/20120623042244/http://www1.skysports.com/football/news/11095/7829653/|archive-date=23 June 2012|url-status=dead}}
{{cite news|title=Castaignos wilde liever naar Feyenoord dan Twente|url=https://www.fcupdate.nl/voetbalnieuws/217124/castaignos-wilde-liever-naar-feyenoord-dan-twente/|publisher=FC Update|language=nl|date=14 October 2012|access-date=5 June 2021}}

=FC Twente=

On 28 July 2012, Castaignos made his return to the Eredivisie when FC Twente agreed to terms with Inter Milan for €6 million.{{cite news|title=Twente achète Castaignos (Inter)|url=https://www.lequipe.fr/Football/Actualites/Twente-achete-castaignos-inter/301491|language=fr|date=28 July 2012|access-date=29 November 2012|archiveurl=https://web.archive.org/web/20120729233425/https://www.lequipe.fr/Football/Actualites/Twente-achete-castaignos-inter/301491|archive-date=29 July 2012|url-status=dead}}
{{cite news|title=Twente capture Castaignos|url=http://www1.skysports.com/football/news/11095/7945949/|publisher=Sky Sports|date=26 July 2012|access-date=29 November 2012|archiveurl=https://web.archive.org/web/20130702110747/http://www1.skysports.com/football/news/11095/7945949/|archive-date=2 July 2013|url-status=dead}}
The move was confirmed on 30 July 2012 when he signed a four–year contract with the club and was given a number thirty shirt.{{cite web|url=http://www.fctwente.nl/blog/2012/07/luc-castaignos-naar-fc-twente|title=Luc Castaignos naar FC Twente|publisher=FC Twente|language=nl|date=30 July 2012|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20120801211114/http://www.fctwente.nl/blog/2012/07/luc-castaignos-naar-fc-twente|archive-date=1 August 2012|url-status=dead}} Castaignos was seen as the replacement for the former Twente striker Luuk de Jong, who had been sold to Borussia Mönchengladbach.{{cite news|title=CASTAIGNOS WIL NU EERSTE KEUS ZIJN|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-beloftenelftal/40450/castaignos-wil-nu-eerste-keus-zijn|publisher=Ons Oranje|language=nl|date=18 July 2012|access-date=5 June 2021}}
{{cite news|title=McClaren ziet 'goede aanwinst' in Castaignos|url=https://www.fcupdate.nl/voetbalnieuws/210695/mcclaren-ziet-goede-aanwinst-in-castaignos/|publisher=FC Update|language=nl|date=31 July 2012|access-date=5 June 2021}}
{{cite news|title=KIEFT: 'GEDULD MET TALENTVOLLE AANVALLERS'|url=https://www.onsoranje.nl/nieuws/ex-internationals/42894/kieft-geduld-met-talentvolle-aanvallers|publisher=Ons Oranje|language=nl|date=29 September 2012|access-date=5 June 2021}}

Castaignos made his debut for FC Twente, coming on as a 70th-minute substitute for Dmitri Bulykin, in a 4–1 win over FC Groningen in the opening game of the season.{{cite web|url=http://www.ad.nl/ad/nl/1001/Sport/article/detail/3300081/2012/08/12/Tadic-maakt-miljoenen-nu-al-waar-in-Enschede.dhtml|title=Tadic maakt miljoenen nu al waar in Enschede|publisher=Algemeen Daglad|language=nl|date=12 August 2012|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20160304043420/http://www.ad.nl/ad/nl/1001/Sport/article/detail/3300081/2012/08/12/Tadic-maakt-miljoenen-nu-al-waar-in-Enschede.dhtml|archive-date=4 March 2016|url-status=dead}} On 26 August 2012, he scored his first goal for the club and set up a goal for Dmitri Bulykin in a 3–1 win over NEC Nijmegen.{{cite news|title=FC Twente blijft koploper na weer open huis in Nijmegen|url=https://www.trouw.nl/nieuws/fc-twente-blijft-koploper-na-weer-open-huis-in-nijmegen~b1944220/|publisher=Trouw|language=nl|date=26 August 2012|access-date=5 June 2021}} Four days later on 30 August 2012, Castaignos helped FC Twente when he set up a goal for Felipe Gutiérrez, in a 4–1 win against Bursaspor in the second leg of the UEFA Europa League play-off round and helping the club progress to the group stage.{{cite news|title=FC Twente knokt zich naar groepsfase Europa League – AZ Uitgeschakeld|url=https://www.nrc.nl/nieuws/2012/08/30/ook-az-uitgeschakeld-in-voorronde-europa-league-a1442075|work=NRC Handelsblad|language=nl|date=30 August 2012|access-date=5 June 2021}} Since joining FC Twente, Castaignos quickly established himself as the club's first choice striker and was living up to his potential as De Jong's successor.{{cite news|title= FC Twente toch zonder Douglas tegen VVV|url=http://www.fcupdate.nl/voetbalnieuws/213496/fc-twente-toch-zonder-douglas-tegen-vvv/|publisher=FC Update|language=nl|date=2 September 2012|access-date=5 June 2021}}
{{cite news|title=Castaignos: "Heb klik met aardig wat spelers"|url=http://www.fcupdate.nl/voetbalnieuws/214671/castaignos-heb-klik-met-aardig-wat-spelers|publisher=FC Update|language=nl|date=17 September 2012|access-date=5 June 2021}}
{{cite news|title=CASTAIGNOS BEREID OM TE VECHTEN|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-beloftenelftal/45502/castaignos-bereid-om-te-vechten|publisher=Ons Oranje|language=nl|date=15 December 2012|access-date=5 June 2021}}
{{cite news|title=Chadli: "Aanvallend hebben we meer variatie"|url=http://www.fcupdate.nl/voetbalnieuws/224685/chadli-aanvallend-hebben-we-meer-variatie/|publisher=FC Update|language=nl|date=9 January 2013|access-date=5 June 2021}}
{{cite news|title=Bulykin lijkt uitgevoetbald bij FC Twente|url=https://www.fcupdate.nl/voetbalnieuws/235697/bulykin-lijkt-uitgevoetbald-bij-fc-twente/|publisher=FC Twente|language=nl|date=14 May 2013|access-date=5 June 2021}}
His second goal for Twente came on 15 September 2012, in a 6–2 win against Willem II.{{cite news|title=Vernieuwd Twente heeft geen kind aan Willem II|url=http://www.fcupdate.nl/voetbalnieuws/214531/vernieuwd-twente-heeft-geen-kind-aan-willem-ii/|publisher=FC Update|language=nl|date=15 September 2012|access-date=5 June 2021}} He then scored two goals in two matches between 7 October 2012 and 20 October 2012 against AZ Alkmaar and Roda JC respectively.{{cite news|title=FC Twente slaat toe in absurde topper met twee keer|url=https://www.trouw.nl/nieuws/fc-twente-slaat-toe-in-absurde-topper-met-twee-keer-rood-in-1-minuut~b4ec6da4/|publisher=Trouw|language=nl|date=7 October 2012|access-date=5 June 2021}}
{{cite news|title=Roda JC houdt koploper in toom|url=https://www.trouw.nl/nieuws/roda-jc-houdt-koploper-in-toom~bc1a9691/|publisher=Trouw|language=nl|date=22 October 2012|access-date=5 June 2021}}
In a match against FC Den Bosch in the third round of the KNVB Cup on 30 October 2012, Castaignos set up the club's only goal of the game, but was sent–off for a second bookable offence, in a 2–1 loss.{{cite news|title=Slap FC Twente-negental laat zich verrassen|url=http://www.fcupdate.nl/voetbalnieuws/218645/slap-fc-twente-negental-laat-zich-verrassen/|publisher=FC Update|language=nl|date=1 November 2012|access-date=5 June 2021}} Although his suspension only effect on the KNVB Cup and went on to serve a suspension the following season, he scored his fifth goal of the season, in a 3–0 win against his former club, Feyenoord on 4 November 2012.{{cite news|title=Twente mist Boyata tegen Feyenoord en Vitesse|url=http://www.fcupdate.nl/voetbalnieuws/218702/twente-mist-boyata-tegen-feyenoord-en-vitesse/|publisher=FC Update|language=nl|date=2 November 2012|access-date=5 June 2021}}
{{cite news|title=En dat steekt in Rotterdam|url=https://www.nrc.nl/nieuws/2012/11/05/en-dat-steekt-in-rotterdam-12573374-a1057698|work=NRC Handelsblad|language=nl|date=5 November 2012|access-date=5 June 2021}}
{{cite news|title=Twente-coach vreest omschakeling Heerenveen|url=http://www.fcupdate.nl/voetbalnieuws/242742/twente-coach-heerenveen-levensgevaarlijk-in-omschakeling/|publisher=FC Update|language=nl|date=25 September 2013|access-date=5 June 2021}}
By the end of the year, Castaignos scored four more goals, including two goals in two matches between 14 December 2012 and 21 December 2012 against Heracles Almelo and AZ Alkmaar respectively.{{cite news|title=Castaignos redt FC Twente in slotminuut van blamage|url=https://www.trouw.nl/nieuws/castaignos-redt-fc-twente-in-slotminuut-van-blamage~b37458c6/|publisher=Trouw|language=nl|date=26 September 2012|access-date=5 June 2021}}
{{cite web|url=http://www.fctwente.nl/blog/2012/11/tegenvallend-gelijkspel-tegen-pec-zwolle/|title=Tegenvallend gelijkspel tegen PEC Zwolle|publisher=FC Twente|language=nl|date=25 November 2012|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20121130025306/http://www.fctwente.nl:80/blog/2012/11/tegenvallend-gelijkspel-tegen-pec-zwolle/|archive-date=30 November 2012|url-status=dead}}
{{cite news|title=Foutloze derby noodzakelijk voor FC Twente|url=https://www.trouw.nl/nieuws/foutloze-derby-noodzakelijk-voor-fc-twente~ba3df2dd/|publisher=Trouw|language=nl|date=14 December 2012|access-date=5 June 2021}}
{{cite news|title=Late slachting bezorgt FC Twente de koppositie|url=http://www.fcupdate.nl/voetbalnieuws/223374/late-slachting-bezorgt-fc-twente-de-koppositie|publisher=FC Update|language=nl|date=21 December 2012|access-date=5 June 2021}}
He had to wait until on 17 March 2013 to score his tenth goal of the season, in a 3–0 win against FC Groningen.{{cite news|title=Twente boekt eerste zege van 2013|url=https://www.volkskrant.nl/nieuws-achtergrond/twente-boekt-eerste-zege-van-2013~b5868560/|publisher=De Volkstrant|language=nl|date=17 March 2013|access-date=5 June 2021}} Castaignos later scored four more goals later in the 2012–13 season, including two goals in two matches between 21 April 2013 and 28 April 2013 against VVV-Venlo and NEC Nijmegen.{{cite news|title=FC Twente boekt eerste zege - Vitesse zegeviert over NAC|url=https://www.nrc.nl/nieuws/2013/04/06/vitesse-zegeviert-op-nac-a1435798|work=NRC Handelsblad|language=nl|date=6 April 2013|access-date=5 June 2021}}
{{cite news|title=Twente voorkomt binnen twee minuten blamage in Venlo|url=https://www.trouw.nl/nieuws/twente-voorkomt-binnen-twee-minuten-blamage-in-venlo~b9c105fa/|publisher=Trouw|language=nl|date=21 April 2013|access-date=5 June 2021}}
{{cite web|url=http://www.ad.nl/ad/nl/1001/Sport/article/detail/3433157/2013/04/28/Zon-en-veel-goals-Twente-tegen-lamlendig-NEC.dhtml|title=Zon en veel goals Twente tegen lamlendig NEC|publisher=Algemeen Dagbladet|language=nl|date=28 April 2013|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20160304060236/http://www.ad.nl/ad/nl/1001/Sport/article/detail/3433157/2013/04/28/Zon-en-veel-goals-Twente-tegen-lamlendig-NEC.dhtml|archive-date=4 March 2016|url-status=dead}}
{{cite news|title=PSV laat zich weer aftroeven, hard onderuit bij FC Twente|url=https://www.trouw.nl/nieuws/psv-laat-zich-weer-aftroeven-hard-onderuit-bij-fc-twente~b0093df6/|publisher=Trouw|language=nl|date=12 May 2013|access-date=5 June 2021}}
He was featured in four matches in the play-offs spot for the UEFA Europa League next season, as FC Twente lost 3–2 against FC Utrecht in the final.{{cite news|title=FC Twente start seizoenstoetje met nipte zege|url=https://www.fcupdate.nl/voetbalnieuws/235861/fc-twente-start-seizoenstoetje-met-nipte-zege/|publisher=FC Update|language=nl|date=16 May 2013|access-date=5 June 2021}}
{{cite web|url=http://www.ad.nl/eredivisie/fc-twente-houdt-europese-droom-levend-na-sensationele-zege~ae496db7/|title=FC Twente houdt Europese droom levend na sensationele zege|publisher=Algemeen Dagbladet|language=nl|date=19 May 2013|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20160918023926/http://www.ad.nl/eredivisie/fc-twente-houdt-europese-droom-levend-na-sensationele-zege~ae496db7/|archive-date=18 September 2016|url-status=dead}}
{{cite news|title=FC Utrecht vecht zich naar Europa League-ticket|url=https://www.fcupdate.nl/voetbalnieuws/236575/fc-utrecht-vecht-zich-naar-europa-league-ticket/|publisher=FC Update|language=nl|date=26 May 2013|access-date=5 June 2021}}
Despite suffering one injury throughout the 2012–13 season, Castaignos went on to make 44 appearances and scoring fourteen times in all competitions, making him the league's top scorer for the club.{{cite news|title=Cabral vervangt geblesseerde Chadli bij Twente|url=http://www.fcupdate.nl/voetbalnieuws/219280/cabral-vervangt-geblesseerde-chadli-bij-twente/|publisher=FC Update|language=nl|date=8 November 2012|access-date=5 June 2021}}

At the start of the 2013–14 season, Castaignos started the season well for FC Twente when he scored against Feyenoord on 11 August 2013 and twice against FC Utrecht in a follow–up match.{{cite news|title=Feyenoord mist Janmaat, Mathijsen terug in basis|url=http://www.fcupdate.nl/voetbalnieuws/240380/feyenoord-mist-janmaat-mathijsen-terug-in-basis|publisher=FC Update|language=nl|date=11 August 2013|access-date=5 June 2021}}
{{cite news|title=Einde succesreeks Feyenoord door pijnlijke thuisnederlaag|url=https://www.vi.nl/nieuws/einde-succesreeks-feyenoord-door-pijnlijke-thuisnederlaag|publisher=Voetbal International|language=nl|date=11 August 2013|access-date=5 June 2021}}
{{cite news|title=Promes en Castaignos loodsen Twente langs machteloos Utrecht|url=https://www.nrc.nl/nieuws/2013/08/18/promes-en-castaignos-loodsen-twente-langs-machteloos-utrecht-6-0-a1432331|work=NRC Handelsblad|language=nl|date=18 August 2013|access-date=5 June 2021}}
Since the start of the 2013–14 season, he continued to established himself as the club's first choice striker.{{cite news|title=Castaignos: "Gewoon doorgaan"|url=https://www.fcupdate.nl/voetbalnieuws/241473/castaignos-gewoon-doorgaan/|publisher=FC Update|language=nl|date=1 September 2013|access-date=5 June 2021}}
{{cite news|title=Twente met vertrouwde elf tegen Groningen|url=https://www.fcupdate.nl/voetbalnieuws/242958/twente-met-vertrouwde-elf-tegen-groningen/|publisher=FC Update|language=nl|date=29 September 2013|access-date=5 June 2021}}
{{cite news|title=Castaignos: "Ik blijf hongerig naar meer"|url=http://www.fcupdate.nl/voetbalnieuws/247195/castaignos-ik-blijf-hongerig-naar-meer/|publisher=FC Update|language=nl|date=11 December 2013|access-date=5 June 2021}}
{{cite news|title=CASTAIGNOS: 'VOEL ME STEEDS BETER'|url=https://www.onsoranje.nl/nieuws/jong-oranje/55986/castaignos-voel-me-steeds-beter|publisher=Ons Oranje|language=nl|date=31 December 2013|access-date=5 June 2021}}
During a 2–2 draw against PSV Eindhoven on 14 September 2013 in which Castaignos set up two goals, he was involved in an altercation with Stijn Schaars once the match was full time, leading to a scuffle involving several players.{{cite news|title=Twente doet zichzelf tekort in enerverende topper tegen PSV|url=https://www.trouw.nl/nieuws/twente-doet-zichzelf-tekort-in-enerverende-topper-tegen-psv~bd0350f3/|publisher=Trouw|language=nl|date=14 September 2013|access-date=5 June 2021}}
{{cite news|title=Schaars: "Opstootje van beide kanten dom"|url=https://www.fcupdate.nl/voetbalnieuws/242196/schaars-opstootje-van-beide-kanten-dom/|publisher=FC Update|language=nl|date=16 September 2013|access-date=5 June 2021}}
{{cite news|title=Aanklager buigt zich over opstootje in Enschede|url=http://www.fcupdate.nl/voetbalnieuws/242256/aanklager-buigt-zich-over-opstootje-in-enschede/|publisher=FC Update|language=nl|date=17 September 2013|access-date=5 June 2021}}
After the match, it was announced that Castaignos would not face charges by the KNVB.{{cite news|title=Castaignos krijgt geen straf na opstootje|url=http://www.fcupdate.nl/voetbalnieuws/242274/castaignos-krijgt-geen-straf-na-opstootje/|publisher=FC Update|language=nl|date=17 September 2013|access-date=5 June 2021}} He scored three goals in three matches between 4 October 2013 and 26 October 2013 against SC Cambuur, Ajax and ADO Den Haag.{{cite news|title=FC Twente wint met 1-0 op bezoek bij Cambuur|url=https://www.nrc.nl/nieuws/2013/10/04/fc-twente-wint-met-1-0-op-bezoek-bij-cambuur-a1430996|work=NRC Handelsblad|language=nl|date=4 October 2013|access-date=5 June 2021}}
{{cite news|title=Twente en Ajax delen punten in magere topper|url=http://www.fcupdate.nl/voetbalnieuws/244107/twente-en-ajax-delen-punten-in-magere-topper/|publisher=FC Update|language=nl|date=19 October 2013|access-date=5 June 2021}}
{{cite web|url=http://www.fctwente.nl/blog/2013/10/fc-twente-lijdt-nederlaag-haag|title=FC Twente lijdt nederlaag in Den Haag|publisher=FC Twente|language=nl|date=26 October 2013|access-date=5 June 2021|archive-url=https://web.archive.org/web/20131030033551/http://www.fctwente.nl/blog/2013/10/fc-twente-lijdt-nederlaag-haag |archive-date=30 October 2013|url-status=dead}}
After quickly recovering from a head injury while on international duty, Castaignos scored two goals in two matches between 24 November 2013 and 29 November 2013 against NAC Breda and Roda JC respectively.{{cite news|title=Schalk en Lukoki vervangen Castaignos en Locadia|url=http://www.fcupdate.nl/voetbalnieuws/245681/schalk-en-lukoki-vervangen-castaignos-en-locadia/|publisher=FC Update|language=nl|date=15 November 2013|access-date=5 June 2021}}
{{cite news|title=Castaignos en Bjelland inzetbaar bij Twente|url=http://www.fcupdate.nl/voetbalnieuws/246080/castaignos-en-bjelland-gewoon-inzetbaar-bij-twente/|publisher=FC Update|language=nl|date=22 November 2013|access-date=5 June 2021}}
{{cite news|title=FC Twente geeft zwak en angstig NEC pak slaag|url=https://www.ad.nl/nederlands-voetbal/fc-twente-geeft-zwak-en-angstig-nec-pak-slaag~af6e0b88/|work=Algemeen Dagblad|language=nl|date=24 November 2013|access-date=5 June 2021}}
{{cite news|title=FC Twente herpakt zich knap en wint in Kerkrade|url=https://www.fcupdate.nl/voetbalnieuws/246555/fc-twente-herpakt-zich-knap-en-wint-in-kerkrade/|publisher=FC Update|language=nl|date=29 November 2013|access-date=5 June 2021}}
He scored four goals in four matches between 14 December 2013 and 2 February 2014.{{cite news|title=FC Twente zonder moeite langs Go Ahead Eagles|url=http://www.fcupdate.nl/voetbalnieuws/247397/fc-twente-zonder-moeite-langs-go-ahead-eagles/|publisher=FC Update|language=nl|date=14 December 2013|access-date=5 June 2021}}
{{cite news|title=FC Twente laat koppositie liggen in Waalwijk|url=http://www.fcupdate.nl/voetbalnieuws/247722/fc-twente-laat-koppositie-liggen-in-waalwijk/|publisher=FC Update|language=nl|date=20 December 2013|access-date=5 June 2021}}
{{cite news|title=FC Twente hervat competitie met zege in streekderby|url=http://www.fcupdate.nl/voetbalnieuws/248989/fc-twente-hervat-competitie-met-zege-in-streekderby/|publisher=FC Update|language=nl|date=14 January 2014|access-date=5 June 2021}}
{{cite news|title=Twente wacht, lokt en sluipt koelbloedig richting de top|url=https://www.trouw.nl/nieuws/twente-wacht-lokt-en-sluipt-koelbloedig-richting-de-top~bff068d1/|publisher=Trouw|language=nl|date=2 February 2014|access-date=5 June 2021}}
Castaignos scored two goals in two matches between 15 February 2014 and 23 February 2014 against Vitesse and Feyenoord.{{cite news|title=FC Twente is gefrustreerd Vitesse de baas in topper|url=https://www.trouw.nl/nieuws/fc-twente-is-gefrustreerd-vitesse-de-baas-in-topper~b98e6c58/|publisher=Trouw|language=nl|date=15 February 2014|access-date=5 June 2021}}
{{cite news|title=Martina schiet Twente op de valreep naast Feyenoord|url=https://www.nrc.nl/nieuws/2014/02/23/martina-schiet-twente-op-de-valreep-naast-feyenoord-a1426979|work=NRC Handelsblad|language=nl|date=23 February 2014|access-date=5 June 2021}}
{{cite news|title=Twente gaat met Castaignos praten over juichgedrag|url=http://www.fcupdate.nl/voetbalnieuws/250690/twente-gaat-met-castaignos-praten-over-juichgedrag/|publisher=FC Update|language=nl|date=17 February 2014|access-date=5 June 2021}}
He played every league match until being suspended for one match for picking a yellow card during a 1–0 loss against Go Ahead Eagles on 9 March 2014.{{cite news|title=Matig FC Twente laat wederom dure punten liggen|url=http://www.fcupdate.nl/voetbalnieuws/251717/matig-fc-twente-laat-wederom-dure-punten-liggen/|publisher=FC Update|language=nl|date=9 March 2014|access-date=5 June 2021}}
{{cite news|title=Jansen: "AZ een pittige kluif voor FC Twente"|url=http://www.fcupdate.nl/voetbalnieuws/251985/jansen-az-een-pittige-kluif-voor-fc-twente/|publisher=FC Update|language=nl|date=14 March 2014|access-date=5 June 2021}}
After serving a one match suspension, Castaignos made his return to the starting line–up against Ajax on 30 March 2014 and played 70 minutes before being substituted, in a 3–0 loss.{{cite news|title=Effectief Ajax neemt voorschot op volgende landstitel|url=http://www.fcupdate.nl/voetbalnieuws/252819/effectief-ajax-neemt-voorschot-op-volgende-landstitel/|publisher=FC Update|language=nl|date=30 March 2014|access-date=5 June 2021}} However, his return was short–lived when he was sent–off in the 88th minute, in a 1–1 draw against ADO Den Haag on 2 April 2014.{{cite news|title= ADO Den Haag blijft ook tegen 'rood' Twente ongeslagen|url=https://www.trouw.nl/nieuws/ado-den-haag-blijft-ook-tegen-rood-twente-ongeslagen~bb544818/|publisher=Trouw|language=nl|date=2 April 2014|access-date=5 June 2021}} After serving a two match suspension, Castaignos returned to the starting line–up against NEC Nijmegen on 27 April 2014 and helped FC Twente qualify for the UEFA Europa League next season.{{cite news|title=Bengtsson mist één wedstrijd, Castaignos twee|url=http://www.fcupdate.nl/voetbalnieuws/253063/bengtsson-mist-een-wedstrijd-castaignos-twee/|publisher=FC Update|language=nl|date=3 April 2014|access-date=5 June 2021}}
{{cite news|title=Castaignos krijgt boete voor 'hartstikke domme' actie|url=http://www.fcupdate.nl/voetbalnieuws/253140/castaignos-krijgt-boete-voor-hartstikke-domme-actie/|publisher=FC Update|language=nl|date=4 April 2014|access-date=5 June 2021}}
{{cite web|url=http://www.fctwente.nl/blog/2014/04/fc-twente-winst-nec-zeker-derde-plek/|title=Het seizoen is weer begonnen|publisher=FC Twente|language=nl|date=27 April 2014|access-date=5 June 2021|archive-url=https://web.archive.org/web/20140429235733/https://www.fctwente.nl/blog/2014/04/fc-twente-winst-nec-zeker-derde-plek/|archive-date=29 April 2014|url-status=dead}}
At the end of the 2013–14 season, he went on to make 31 appearances and scoring fourteen times in all competitions.

Ahead of the 2014–15 season, Castaignos was linked with a move to Bundesliga side Bayer Leverkusen and Premier League side Swansea City.{{cite news|title=Twente-spits Castaignos op radar Bayer Leverkusen|url=http://www.fcupdate.nl/voetbalnieuws/253751/twente-spits-castaignos-op-radar-bayer-leverkusen/|publisher=FC Update|language=nl|date=14 April 2014|access-date=5 June 2021}}
{{cite news|title=Former Inter Milan striker Luc Castaignos interests Swansea City|url=https://www.bbc.co.uk/sport/football/27656556|publisher=BBC Sport|date=1 June 2014|access-date=5 June 2021}}
But he ended up staying at the club throughout the summer transfer window.{{cite news|title=FC Twente houdt rekening met vertrek Castaignos en Tadic|url=http://www.fcupdate.nl/voetbalnieuws/253935/fc-twente-houdt-rekening-met-vertrek-castaignos-en-tadic/|publisher=FC Update|language=nl|date=18 April 2014|access-date=5 June 2021}} At the start of the 2014–15 season, Castaignos continued to established himself as FC Twente's first choice striker.{{cite news|title=Castaignos stopt aansteker in sok tegen ADO|url=http://www.fcupdate.nl/voetbalnieuws/260775/castaignos-stopt-aansteker-in-sok-tegen-ado/|publisher=FC Update|language=nl|date=17 August 2014|access-date=5 June 2021}}
{{cite news|title=Castaignos speelt glansrol: "Zit lekker in mijn vel"|url=http://www.fcupdate.nl/voetbalnieuws/262880/castaignos-speelt-glansrol-zit-lekker-in-mijn-vel/|publisher=FC Update|language=nl|date=21 September 2014|access-date=5 June 2021}}
{{cite news|title=Twente richt speelwijze op Castaignos, Ziyech en Corona|url=https://www.fcupdate.nl/voetbalnieuws/269713/twente-richt-speelwijze-op-castaignos-ziyech-en-corona/|publisher=FC Update|language=nl|date=17 January 2015|access-date=5 June 2021}}
He scored two goals in two matches between 24 August 2014 and 28 August 2014 against NAC Breda and Qarabağ respectively.{{cite news|title=Twente geeft met tien man in blessuretijd zege uit handen|url=http://www.fcupdate.nl/voetbalnieuws/261219/twente-geeft-met-tien-man-in-blessuretijd-zege-uit-handen/|publisher=FC Update|language=nl|date=24 August 2014|access-date=5 June 2021}}
{{cite news|title=Twente speelt weer gelijk en ziet Europese droom uiteenspatten|url=http://www.fcupdate.nl/voetbalnieuws/261496/twente-speelt-weer-gelijk-en-ziet-europese-droom-uiteenspatten/|publisher=FC Update|language=nl|date=28 August 2014|access-date=5 June 2021}}
His goal scoring form throughout September was added to a total of six, including scoring two consecutive goals against Heracles Almelo and Achilles '29.{{cite news|title=Twente profiteert eindelijk van Corona|url=https://www.trouw.nl/nieuws/twente-profiteert-eindelijk-van-corona~ba544c79/|publisher=Trouw|language=nl|date=13 September 2014|access-date=5 June 2021}}
{{cite news|title=FC Twente veel sterker dan puntloos Heracles|url=https://www.trouw.nl/nieuws/fc-twente-veel-sterker-dan-puntloos-heracles~ba5c39b3/|publisher=Trouw|language=nl|date=21 September 2014|access-date=5 June 2021}}
{{cite news|title=Castaignos bezorgt FC Twente eenvoudige bekeravond|url=https://www.vi.nl/nieuws/castaignos-bezorgt-fc-twente-eenvoudige-bekeravond-|publisher=Voetbal International|language=nl|date=25 September 2014|access-date=5 June 2021}}
{{cite news|title=Inspiratieloos Twente ontsnapt tegen FC Utrecht|url=https://www.trouw.nl/nieuws/inspiratieloos-twente-ontsnapt-tegen-fc-utrecht~b6f21a90/|publisher=Trouw|language=nl|date=28 September 2014|access-date=5 June 2021}}
A month later on 26 October 2014, Castaignos scored his ninth goal of the season, in a 2–1 loss against SBV Excelsior.{{cite news|title=Excelsior brengt FC Twente eerste verlies toe|url=https://www.vi.nl/nieuws/excelsior-brengt-fc-twente-eerste-verlies-toe|publisher=Voetbal International|language=nl|date=26 October 2014|access-date=5 June 2021}} He then scored three more goals between 23 November 2014 and 30 November 2014, including a brace against PEC Zwolle.{{cite news|title=Castaignos bezorgt Twente zege in Overijsselse derby|url=https://www.fcupdate.nl/voetbalnieuws/266647/castaignos-bezorgt-twente-zege-in-overijsselse-derby/|publisher=FC Update|language=nl|date=23 November 2014|access-date=5 June 2021}}
{{cite news|title=FC Groningen boekt knappe zege op bezoek bij FC Twente|url=https://www.fcupdate.nl/voetbalnieuws/267080/fc-groningen-boekt-knappe-zege-op-bezoek-bij-fc-twente/|publisher=FC Update|language=nl|date=30 November 2014|access-date=5 June 2021}}
However, Castaignos suffered a setback when he suffered an eye injury and was sidelined for a month.{{cite news|title=Castaignos tot 2015 uitgeschakeld na ingreep aan oog|url=https://www.fcupdate.nl/voetbalnieuws/267290/castaignos-tot-winterstop-uitgeschakeld/|publisher=FC Update|language=nl|date=4 December 2014|access-date=5 June 2021}}
{{cite news|title=Castaignos dankt arts: "Anders misschien blind geworden"|url=https://www.fcupdate.nl/voetbalnieuws/271454/castaignos-is-dankt-arts-anders-misschien-blind-geworden/|publisher=FC Update|language=nl|date=14 February 2015|access-date=5 June 2021}}
{{cite news|title=Castaignos: "Voor hetzelfde geld was ik blind geworden"|url=https://www.fcupdate.nl/voetbalnieuws/276849/castaignos-voor-hetzelfde-geld-was-ik-blind-geworden/|publisher=FC Update|language=nl|date=16 May 2015|access-date=5 June 2021}}
Castaignos previously suffered a hamstring injury two months prior while on international duty but he quickly recovered.{{cite news|title=Jong Oranje mist Castaignos in return tegen Portugal|url=https://www.fcupdate.nl/voetbalnieuws/263985/jong-oranje-mist-castaignos-in-return-tegen-portugal/|publisher=FC Update|language=nl|date=10 October 2014|access-date=5 June 2021}}
{{cite news|title=Twente-topscorer Castaignos lijkt Ajax-thuis te halen|url=https://www.fcupdate.nl/voetbalnieuws/264132/twente-topscorer-castaignos-lijkt-ajax-thuis-te-halen/|publisher=FC Update|language=nl|date=13 October 2014|access-date=5 June 2021}}
{{cite news|title=Castaignos kan spelen in topper tegen Ajax|url=https://www.fcupdate.nl/voetbalnieuws/264387/castaignos-kan-spelen-in-topper-tegen-ajax/|publisher=FC Update|language=nl|date=17 October 2014|access-date=5 June 2021}}
Castaignos returned to the starting line–up against his former club, Feyenoord on 17 January 2015, as the club lost 3–1.{{cite news|title=Feyenoord maakt in topper einde aan illusies FC Twente|url=http://www.vi.nl/nieuws/feyenoord-maakt-in-topper-einde-aan-illusies-fc-twente.htm|publisher=Voetbal International|language=nl|date=18 January 2015|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20150121045340/http://www.vi.nl/nieuws/feyenoord-maakt-in-topper-einde-aan-illusies-fc-twente.htm|archive-date=21 January 2015|url-status=dead}} Ten days later on 27 January 2015, he scored his thirteenth goal of the season, in a 3–0 win against AZ Alkmaar in the quarter–finals of the KNVB Cup.{{cite news|title=Ziyech dirigeert Twente tegen AZ naar laatste vier|url=https://www.vi.nl/nieuws/ziyech-dirigeert-twente-tegen-az-naar-laatste-vier|publisher=Voetbal International|language=nl|date=27 January 2015|access-date=5 June 2021}} On 28 February 2015, Castaignos scored his fourteenth goal of the season, in a 1–1 draw against NAC Breda.{{cite news|title=NAC pakt in slotfase punt bij matig FC Twente|url=https://www.fcupdate.nl/voetbalnieuws/272306/nac-pakt-in-slotfase-punt-bij-matig-fc-twente/|publisher=FC Update|language=nl|date=28 February 2015|access-date=5 June 2021}} However, during a 2–0 win against PEC Zwolle on 14 March 2015, he suffered a hamstring injury and was substituted at half time.{{cite news|title=FC Twente wint eindelijk weer en mag blijven hopen op EL|url=https://www.fcupdate.nl/voetbalnieuws/273109/fc-twente-wint-eindelijk-weer-en-mag-blijven-hopen-op-el/|publisher=FC Update|language=nl|date=14 March 2015|access-date=5 June 2021}} After missing two matches, Castaignos returned to the first team from injury, coming on as a 71st-minute substitute, in a 3–1 win against Go Ahead Eagles on 12 April 2015.{{cite news|title=Onderzoek voor Bjelland, Engelaar en Castaignos|url=https://www.fcupdate.nl/voetbalnieuws/273139/onderzoek-voor-bjelland-engelaar-en-castaignos/|publisher=FC Update|language=nl|date=15 March 2015|access-date=5 June 2021}}
{{cite news|title=Castaignos, Ziyech en Tapia terug bij FC Twente|url=https://www.fcupdate.nl/voetbalnieuws/274493/castaignos-ziyech-en-tapia-terug-bij-fc-twente/|publisher=FC Update|language=nl|date=7 April 2015|access-date=5 June 2021}}
{{cite news|title=FC Twente neemt sportieve revanche na rampweek|url=http://www.ad.nl/eredivisie/fc-twente-neemt-sportieve-revanche-na-rampweek~a10b2671/|newspaper=Algemeen Dagblad|language=nl|date=12 April 2015|access-date=5 June 2015}}
At the end of the 2014–15 season, he went on to make 35 appearances and scoring fourteen times in all competitions.

=Eintracht Frankfurt=

After three prolific seasons at Twente, Castaignos was expected to leave FC Twente in the summer transfer window, due to the club's financial problems.{{cite news|title=Castaignos: "Heb meegekregen dat Twente van me af wil"|url=https://www.fcupdate.nl/voetbalnieuws/272678/castaignos-heb-meegekregen-dat-twente-van-me-af-wil/|publisher=FC Update|language=nl|date=7 March 2015|access-date=5 June 2021}}
{{cite news|title=Spitsenprobleem dreigt in de zomer voor FC Twente|url=https://www.fcupdate.nl/voetbalnieuws/276350/spitsenprobleem-dreigt-in-de-zomer-voor-fc-twente/|publisher=FC Update|language=nl|date=8 May 2015|access-date=5 June 2021}}
{{cite news|title=Castaignos: "Niet leuk als je hoort dat ze je liever verkopen"|url=https://www.fcupdate.nl/voetbalnieuws/276877/castaignos-niet-leuk-als-je-hoort-dat-ze-je-liever-verkopen/|publisher=FC Update|language=nl|date=17 May 2015|access-date=5 June 2021}}
As a result, he was linked with a move to Swansea City and Bundesliga outfit Eintracht Frankfurt.{{cite news|title=Luc Castaignos: Swansea City tracking FC Twente striker|url=https://www.bbc.co.uk/sport/football/32812900|publisher=BBC Sport|date=20 May 2015|access-date=5 June 2021}}
{{cite news|title=Afwezige Castaignos op weg naar uitgang bij FC Twente|url=https://www.fcupdate.nl/voetbalnieuws/279328/afwezige-castaignos-op-weg-naar-uitgang-bij-fc-twente/|publisher=FC Update|language=nl|date=29 June 2015|access-date=5 June 2021}}
On 29 June 2015, it was reported that Eintracht Frankfurt agreed to sign Castaignos for a reported €4 million move.{{cite news|title=Eintracht vor Verpflichtung von Castaignos|url=https://www.fr.de/eintracht-frankfurt/eintracht-verpflichtung-castaignos-11171702.html|publisher=Frankfurter Rundschau|language=de|date=29 June 2015|access-date=5 June 2021}} The move was confirmed the next day, with the player signed a three–year contract with the club.{{cite web|url=http://www.fctwente.nl/blog/2015/06/luc-castaignos-eintracht-frankfurt/|title=Luc Castaignos naar Eintracht Frankfurt|publisher=FC Twente|language=nl|date=30 June 2015|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20150702144131/http://www.fctwente.nl/blog/2015/06/luc-castaignos-eintracht-frankfurt/|archive-date=2 July 2015|url-status=dead}}
{{cite news|title=Castaignos wechselt aus Enschede zu Eintracht Frankfurt|url=https://www.fr.de/sport/fussball/castaignos-wechselt-enschede-eintracht-frankfurt-11200746.html|publisher=Frankfurter Rundschau|language=de|date=30 June 2015|access-date=5 June 2021}}
{{Cite web|title=Alles klar zwischen der Eintracht und Castaignos|trans-title=Everything cleared between the Eintracht and Castaignos|url=https://www.kicker.de/alles-klar-zwischen-der-eintracht-und-castaignos-629927/artikel|publisher=kicker|language=de|date=30 June 2015|access-date=5 June 2021|archive-url=https://web.archive.org/web/20150702083417/http://www.kicker.de/news/fussball/bundesliga/vereine/629927/artikel_alles-klar-zwischen-der-eintracht-und-castaignos.html|archive-date=2 July 2015|url-status=live}}
However, the transfer fee was disputed, as it cost whether €2.5 million and €4 million.{{cite news|title=Sturmwarnung an der Elbe|url=https://www.fr.de/eintracht-frankfurt/sturmwarnung-elbe-11159875.html|publisher=Frankfurter Rundschau|language=de|date=19 September 2015|access-date=5 June 2021}}
{{cite news|title=Ein Versprechen für die Zukunft|url=https://www.fr.de/eintracht-frankfurt/versprechen-zukunft-11159891.html|publisher=Frankfurter Rundschau|date=25 September 2015|access-date=5 June 2021}}

However, during a 2–1 win against Leeds United in a friendly match on 21 July 2015, he suffered a thigh injury and had to be substituted in the 20th minute.{{cite web|url=http://www.eintracht.de/en/news/article/eintracht-turn-the-match-around-defeat-leeds-united-50086/|title=Eintracht turn the match around, defeat Leeds United|publisher=Eintracht Frankfurt|date=21 July 2015|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20150924005940/http://www.eintracht.de/en/news/article/eintracht-turn-the-match-around-defeat-leeds-united-50086/|archive-date=24 September 2015|url-status=dead}} This threatened to cause him to miss the start of the 2015–16 season by being sidelined between two and four weeks.{{cite news|title=Schreck für Eintracht: Castaignos verletzt|url=https://www.fr.de/sport/fussball/schreck-eintracht-castaignos-verletzt-11158047.html|publisher=Frankfurter Rundschau|language=de|date=21 July 2015|access-date=5 June 2021}}
{{cite news|title=Castaignos zurück nach Frankfurt|url=https://www.fr.de/eintracht-frankfurt/castaignos-zurueck-nach-frankfurt-11193729.html|publisher=Frankfurter Rundschau|language=de|date=22 July 2015|access-date=5 June 2021}}
{{cite news|title=Muskelfaserriss bei Frankfurts Castaignos|url=https://www.fr.de/sport/fussball/muskelfaserriss-frankfurts-castaignos-11158073.html|publisher=Frankfurter Rundschau|language=de|date=22 July 2015|access-date=5 June 2021}}
But Castaignos quickly made a full recovery from a thigh injury.{{cite news|title=Frisch und ausgeruht|url=https://www.fr.de/eintracht-frankfurt/frisch-ausgeruht-11193773.html|publisher=Frankfurter Rundschau|language=de|date=29 July 2015|access-date=5 June 2021}}
{{cite news|title=Abraham fällt aus|url=https://www.fr.de/eintracht-frankfurt/abraham-faellt-11193719.html|publisher=Frankfurter Rundschau|language=de|date=5 August 2015|access-date=5 June 2021}}
He made his debut for the club in the first round of the DFB–Pokal against Bremer SV on 8 August 2015 and scored his first goal for Eintracht Frankfurt, in a 3–0 win.{{cite news|title=Starke Zugänge beim souveränen Frankfurter 3:0-Sieg|url=https://www.fr.de/sport/fussball/starke-zugaenge-beim-souveraenen-frankfurter-30-sieg-11139667.html|publisher=Frankfurter Rundschau|language=de|date=8 August 2015|access-date=5 June 2021}} Castaignos scored two braces in two matches between 29 August 2015 and 12 September 2015, winning both matches against VfB Stuttgart and 1. FC Köln.{{cite web|url=https://www.kicker.de/stuttgart-gegen-frankfurt-2015-bundesliga-2854954/analyse|title=Eiskalte SGE bestraft Stuttgarts Sünden|website=Kicker|language=de|date=29 August 2015|access-date=5 June 2021|archive-url=https://web.archive.org/web/20160406121055/http://www.kicker.de/news/fussball/bundesliga/spieltag/1-bundesliga/2015-16/3/2854954/spielanalyse_vfb-stuttgart-11_eintracht-frankfurt-32.html|archive-date=6 April 2016|url-status=live}}
{{cite news|title=Meier-Comeback: Drei Tore bei Eintracht-Gala gegen Köln|url=https://www.fr.de/sport/fussball/meier-comeback-drei-tore-eintracht-gala-gegen-koeln-11145623.html|publisher=Frankfurter Rundschau|language=de|date=12 September 2015|access-date=5 June 2021}}
Since joining the club, he quickly become involved in the first team, becoming Eintracht Frankfurt's first choice striker with Haris Seferovic.{{cite news|title=Der Gewinner vom Vinnenweg|url=https://www.fr.de/eintracht-frankfurt/gewinner-vinnenweg-11193696.html|publisher=Frankfurter Rundschau|language=de|date=10 August 2015|access-date=5 June 2021}}
{{cite news|title=Veh setzt auf Flexibilität|url=https://www.fr.de/eintracht-frankfurt/setzt-flexibilitaet-11193740.html|publisher=Frankfurter Rundschau|language=de|date=17 August 2015|access-date=5 June 2021}}
{{cite news|title=Castaignos und Seferovic: Eintrachts treffsicheres Duo|url=https://www.fr.de/sport/fussball/castaignos-seferovic-eintrachts-treffsicheres-11194143.html|publisher=Frankfurter Rundschau|language=de|date=30 August 2015|access-date=5 June 2021}}
{{cite news|title=Luxusproblem wegen Meier|url=https://www.fr.de/eintracht-frankfurt/luxusproblem-wegen-meier-11193760.html|publisher=Frankfurter Rundschau|language=de|date=5 September 2015|access-date=5 June 2021}}
{{cite news|title=Suche nach Nussknackern|url=https://www.fr.de/eintracht-frankfurt/suche-nach-nussknackern-11159895.html|publisher=Frankfurter Rundschau|language=de|date=25 September 2015|access-date=5 June 2021}}
After a promising start at the club, Castaignos' performance was criticised due to not scoring regularly and was demoted to the substitute bench as a result.{{cite news|title=Sturm im Wasserglas|url=https://www.fr.de/eintracht-frankfurt/sturm-wasserglas-11159831.html|publisher=Frankfurter Rundschau|language=de|date=20 September 2015|access-date=5 June 2021}}
{{cite news|title=Eintracht verpasst Sieg: Darida sichert Hertha einen Punkt|url=https://www.fr.de/sport/fussball/eintracht-verpasst-sieg-darida-sichert-hertha-einen-punkt-1-11209047.html|publisher=Frankfurter Rundschau|language=de|date=27 September 2015|access-date=5 June 2021}}
{{cite news|title=Im Einheitstrott zum Einheitsbrei|url=https://www.fr.de/eintracht-frankfurt/einheitstrott-einheitsbrei-11189987.html|publisher=Frankfurter Rundschau|language=de|date=5 October 2015|access-date=5 June 2021}}
{{cite news|title="Wir haben Sympathien verspielt"|url=https://www.fr.de/eintracht-frankfurt/wir-haben-sympathien-verspielt-11190018.html|publisher=Frankfurter Rundschau|language=de|date=6 October 2015|access-date=5 June 2021}}
{{cite news|title=Meister unter Flutlicht|url=https://www.fr.de/eintracht-frankfurt/meister-unter-flutlicht-11189964.html|publisher=Frankfurter Rundschau|language=de|date=13 October 2015|access-date=5 June 2021}}
But his performance soon improved, with manager Armin Veh acknowledging his adaption to the German style.{{cite news|title=Veh warnt vor Sorglosigkeit|url=https://www.fr.de/eintracht-frankfurt/warnt-sorglosigkeit-11082685.html|publisher=Frankfurter Rundschau|language=de|date=4 November 2015|access-date=5 June 2021}}
{{cite news|title=Partner ohne kalte Schnauze|url=https://www.fr.de/eintracht-frankfurt/partner-ohne-kalte-schnauze-11189942.html|publisher=Frankfurter Rundschau|language=de|date=9 November 2015|access-date=5 June 2021}}
However, Castaignos suffered ankle injury during a match against Bayer Leverkusen on 21 November 2015 and was substituted in the 22nd minute, as Eintracht Frankfurt lost 3–1.{{cite news|title=Chancenlos gegen Bayer|url=https://www.fr.de/eintracht-frankfurt/chancenlos-gegen-bayer-11189994.html|publisher=Frankfurter Rundschau|language=de|date=21 November 2015|access-date=5 June 2021}}
{{cite news|title=Hernandez trifft und trifft: Leverkusen wieder in der Spur|url=https://www.fr.de/sport/fussball/hernandez-trifft-trifft-leverkusen-wieder-spur-11196757.html|publisher=Frankfurter Rundschau|language=de|date=21 November 2015|access-date=5 June 2021}}
After the match, it was announced that the player would be sidelined for three months.{{cite news|title=Frankfurter Castaignos fällt bis zur Winterpause aus|url=https://www.fr.de/sport/fussball/frankfurter-castaignos-faellt-winterpause-11443556.html|publisher=Frankfurter Rundschau|language=de|date=22 November 2015|access-date=5 June 2021}}
{{cite news|title=Geslaagde operatie voor Luc Castaignos|url=https://www.rijnmond.nl/nieuws/135424/Geslaagde-operatie-voor-Luc-Castaignos|publisher=RTV Rijnmond|language=nl|date=24 November 2015|access-date=5 June 2021}}
{{cite news|title=Trainer Veh gehen die Spieler aus|url=https://www.fr.de/eintracht-frankfurt/trainer-gehen-spieler-11139063.html|publisher=Frankfurter Rundschau|language=de|date=25 November 2015|access-date=5 June 2021}}
On 12 March 2016, he made his return from injury, coming on as an 86th-minute substitute, in a 3–0 loss against Borussia Mönchengladbach.{{cite news|title=Castaignos sehnt das Mannschaftstraining herbei|url=https://www.kicker.de/castaignos-sehnt-das-mannschaftstraining-herbei-645812/artikel|website=Kicker|language=de|date=23 February 2016|access-date=5 June 2021}}
{{cite news|title=Neustart kurz vor Ultimo|url=https://www.fr.de/eintracht-frankfurt/neustart-kurz-ultimo-11120809.html|publisher=Frankfurter Rundschau|language=de|date=11 March 2016|access-date=5 June 2021}}
{{cite news|title=Hradecky beschenkt Gladbachs Sturmduo|url=https://www.kicker.de/mgladbach-gegen-frankfurt-2016-bundesliga-2855405/analyse|website=Kicker|language=de|date=12 March 2016|access-date=5 June 2021}}
Following his return from injury, Castaignos continued to be relegated to the bench in the second part of the season, as well as, his goal drought.{{cite news|title=Viel Zement und ein frommer Wunsch|url=https://www.fr.de/eintracht-frankfurt/viel-zement-frommer-wunsch-11120857.html|publisher=Frankfurter Rundschau|language=de|date=29 March 2016|access-date=5 June 2021}}
{{cite news|title=Alex Meier fällt nach Knie-OP länger aus|url=https://www.fr.de/eintracht-frankfurt/alex-meier-faellt-nach-knie-op-laenger-11119098.html|publisher=Frankfurter Rundschau|language=de|date=4 April 2016|access-date=5 June 2021}}
{{cite news|title=Frankfurt nach 0:2 gegen Hoffenheim in Abstiegsnöten|url=https://www.fr.de/sport/fussball/frankfurt-nach-gegen-hoffenheim-abstiegsnoeten-11129306.html|publisher=Frankfurter Rundschau|language=de|date=9 April 2016|access-date=5 June 2021}}
{{cite news|title=Entsetzen in Frankfurt: Der fünfte Abstieg rückt näher|url=https://www.fr.de/sport/fussball/entsetzen-frankfurt-fuenfte-abstieg-rueckt-naeher-11203998.html|publisher=Frankfurter Rundschau|language=de|date=10 April 2016|access-date=5 June 2021}}
{{cite news|title="Es wird nicht einfach, gegen uns zu spielen"|url=https://www.fr.de/eintracht-frankfurt/wird-nicht-einfach-gegen-spielen-11205628.html|publisher=Frankfurter Rundschau|language=de|date=22 April 2016|access-date=5 June 2021}}
He played in the first leg of the Bundesliga play-offs against 1. FC Nürnberg as the late substitute and the club went on to win 2–1 on aggregate to avoid relegation.{{cite news|title=Gacinovic kontert Russ per Flachschuss|url=https://www.kicker.de/frankfurt-gegen-nuernberg-2016-bundesliga-relegation-3296472/analyse|website=Kicker|language=de|date=19 May 2016|access-date=5 June 2021}}
{{cite news|title=Seferovic hält Frankfurt in der Bundesliga|url=https://www.kicker.de/nuernberg-gegen-frankfurt-2016-bundesliga-relegation-3296473/analyse|website=Kicker|language=de|date=23 May 2016|access-date=5 June 2021}}
At the end of the 2015–16 season, Castaignos went on to make 21 appearances and scoring five times in all competitions.

Ahead of the 2016–17 season, Castaignos was expected to stay at Eintracht Frankfurt.{{cite news|title=Aufräumen und ausbessern|url=https://www.fr.de/eintracht-frankfurt/aufraeumen-ausbessern-11205680.html|publisher=Frankfurter Rundschau|language=de|date=4 June 2016|access-date=5 June 2021}}
{{cite news|title=Bobic entstaubt die Eintracht Frankfurt|url=https://www.fr.de/eintracht-frankfurt/bobic-entstaubt-eintracht-11120384.html|publisher=Frankfurter Rundschau|language=de|date=27 June 2016|access-date=5 June 2021}}
{{cite news|title=Stürmer Castaignos will bei Eintracht Frankfurt bleiben|url=https://www.fr.de/sport/fussball/stuermer-castaignos-will-eintracht-frankfurt-bleiben-11093505.html |publisher=Frankfurter Rundschau|language=de|date=27 July 2016|access-date=5 June 2021}}
It came after when Galatasaray, Sporting CP, Newcastle United and Southampton.{{cite news|title="Keiner ist unverkäuflich"|url=https://www.fr.de/eintracht-frankfurt/keiner-unverkaeuflich-11120329.html|publisher=Frankfurter Rundschau|language=de|date=20 June 2016|access-date=5 June 2021}}
{{cite news|title=Eintracht muss Dellen ausbeulen|url=https://www.fr.de/eintracht-frankfurt/eintracht-muss-dellen-ausbeulen-11120388.html|publisher=Frankfurter Rundschau|language=de|date=22 June 2016|access-date=5 June 2021}}
{{cite news|title=Eintracht legt nach|url=https://www.fr.de/eintracht-frankfurt/eintracht-legt-nach-11082614.html|publisher=Frankfurter Rundschau|language=de|date=11 July 2016|access-date=5 June 2021}}
{{cite news|title=Gute Technik und viel Tempo|url=https://www.fr.de/eintracht-frankfurt/gute-technik-viel-tempo-11089601.html|publisher=Frankfurter Rundschau|language=de|date=5 August 2016|access-date=5 June 2021}}
{{cite news|title=Dann halt Messi|url=https://www.fr.de/eintracht-frankfurt/dann-halt-messi-11089645.html|publisher=Frankfurter Rundschau|language=de|date=10 August 2016|access-date=5 June 2021}}
He made first and only appearance for the club against 1. FC Magdeburg in the first round of the DFB–Pokal.{{cite news|title=Frankfurt gewinnt die Lotterie nach einem lauten Knall|url=https://www.kicker.de/magdeburg-gegen-frankfurt-2016-dfb-pokal-3309913/spielbericht|publisher=Kicker|language=de|date=21 August 2016|access-date=5 June 2021}} With his first opportunities at Eintracht Frankfurt, it was expected that Castaignos would be leaving the club.{{cite news|title=Gepflegtes Nichts|url=https://www.fr.de/eintracht-frankfurt/gepflegtes-nichts-11089712.html|publisher=Frankfurter Rundschau|language=de|date=23 August 2016|access-date=5 June 2021}}
{{cite news|title=Saison voller Fragezeichen|url=https://www.fr.de/eintracht-frankfurt/saison-voller-fragezeichen-11095613.html|publisher=Frankfurter Rundschau|language=de|date=25 August 2016|access-date=5 June 2021}}
{{cite news|title=Hübner bestätigt: Stürmer Castaignos wird SGE verlassen|url=https://www.fr.de/sport/fussball/huebner-bestaetigt-stuermer-castaignos-wird-verlassen-11100311.html|publisher=Frankfurter Rundschau|language=de|date=27 August 2016|access-date=5 June 2021}}

=Sporting CP=

In summer 2016, Castaignos joined compatriot Bas Dost at Portuguese side Sporting CP on a three-year deal.{{cite news|title=Castaignos darf nach Lissabon|url=https://www.fr.de/eintracht-frankfurt/castaignos-darf-nach-lissabon-11095563.html|publisher=Frankfurter Rundschau|language=de|date=29 August 2016|access-date=5 June 2021}}
[https://www.vi.nl/nieuws/artikel-detail?name=dubbelslag-sporting-lissabon-castaignos-in-spoor-van-dost&type=nieuws&category=& Dubbelslag Sporting Lissabon: Castaignos in spoor van Dost] – Voetbal International {{in lang|nl}}
{{cite news|title=Oficial: Luc Castaignos assina por três temporadas|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/oficial--luc-castaignos-assina-por-tres-temporadas|publisher=Record|language=pt|date=29 August 2016|access-date=5 June 2021}}
The transfer move reported to have cost €2.5 million and a buyout clause of €60 million.{{cite news|title=Luc Castaignos confirmado no Sporting|url=https://www.publico.pt/2016/08/28/desporto/noticia/luc-castaignos-confirmado-no-sporting-1742559|publisher=Publico|language=pt|date=28 August 2016|access-date=5 June 2021}}{{cite news|title=Defeso dos três "grandes": o empréstimo é a alma do negócio|url=https://www.publico.pt/2016/09/02/desporto/noticia/defeso-dos-tres-grandes-o-emprestimo-e-a-alma-do-negocio-1742949 |publisher=Publico|language=pt|date=2 September 2016|access-date=5 June 2021}} Upon joining the club, he was given a number twenty shirt.{{cite news|title=Conheça os números dos novos leões|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/conheca-os-numeros-dos-novos-leoes|publisher=Record|language=pt|date=6 September 2016|access-date=5 June 2021}}

Castaignos made his long-awaited debut for Sporting CP, coming on as a 61st-minute substitute, in a 1–1 draw against Tondela on 22 October 2016.{{cite news|title=Meli e Castaignos à espreita|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/meli-e-castaignos-a-espreita|publisher=Record|language=pt|date=13 October 2016|access-date=5 June 2021}}
{{cite news|title=Douglas e Castaignos nos eleitos|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/douglas-e-castaignos-nos-eleitos|publisher=Record|language=pt|date=22 October 2016|access-date=5 June 2021}}
{{cite news|title=A crónica do Sporting-Tondela: Lua-de-mel acabou|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/a-cronica-do-sporting-tondela-lua-de-mel-acabou|publisher=Record|language=pt|date=22 October 2016|access-date=5 June 2021}}
He was handed his first start for Sporting only on 2 November 2016, in a Champions League match against Borussia Dortmund and 45 minutes before being substituted, in a 1–0 loss.[https://www.vi.nl/nieuws/artikel-detail?name=dost-blij-met-reserverol-castaignos-verdiende-het&type=nieuws&category=& Dost blij met reserverol: 'Castaignos verdiende het'] – Voetbal International {{in lang|nl}}
{{cite news|title=A crónica do Borussia Dortmund-Sporting: Leão não se vergou|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/a-cronica-do-borussia-dortmund-sporting-leao-nao-se-vergou|publisher=Record|language=pt|date=3 November 2016|access-date=5 June 2021}}
{{cite news|title=Bas Dost: "Suplente? Foi bom pois estava cansado"|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/bas-dost-suplente-foi-bom-pois-estava-cansado|publisher=Record|language=pt|date=4 November 2016|access-date=5 June 2021}}
However, Castaignos found his first team opportunities limited and found his playing time, coming from the substitute bench.{{cite news|title=Zeegelaar sai da convocatória|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/zeegelaar-sai-da-convocatoria|publisher=Record|language=pt|date=18 September 2016|access-date=5 June 2021}}
{{cite news|title=Reforços à espera de vez|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/reforcos-a-espera-de-vez|publisher=Record|language=pt|date=1 October 2016|access-date=5 June 2021}}
{{cite news|title=Slimani é exemplo de persistência para Castaignos|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/slimani-e-exemplo-de-persistencia-para-castaignos|publisher=Record|language=pt|date=16 November 2016|access-date=5 June 2021}}
{{cite news|title=Gestores do treino|url=https://www.record.pt/opiniao/cronistas/antonio-oliveira/detalhe/gestores-do-treino|publisher=Record|language=pt|date=17 November 2016|access-date=5 June 2021}}
{{cite news|title=Lista alargada de estreantes|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/lista-alargada-de-estreantes|publisher=Record|language=pt|date=17 April 2017|access-date=5 June 2021}}
He also found himself plagued with injuries along the way.{{cite news|title=Castaignos será avaliado hoje|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/castaignos-sera-avaliado-hoje|publisher=Record|language=pt|date=1 December 2016|access-date=5 June 2021}}
{{cite news|title=Castaignos vai falhar três jogos|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/castaignos--vai-falhar--tres-jogos|publisher=Record|language=pt|date=2 December 2016|access-date=5 June 2021}}
{{cite news|title=Campbell e Castaignos ficam de 'castigo'|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/campbell-e-castaignos-ficam-de-castigo|publisher=Record|language=pt|date=13 May 2017|access-date=5 June 2021}}
At the end of the 2016–17 season, Castaignos made thirteen appearances in all competitions. Following this, Publico named the player as one of the club's worst signing of the season.{{cite news|title=Contratações para fazer esquecer a pior temporada de Bruno de Carvalho|url=https://www.publico.pt/2017/05/16/desporto/noticia/contratacoes-para-fazer-esquecer-a-pior-temporada-de-bruno-de-carvalho-1772255|publisher=Publico|language=pt|date=16 May 2017|access-date=5 June 2021}}

Following his loan spell at Vitesse came to an end, Castaignos was featured in Sporting CP's pre–season squad.{{cite news|title=Quatro reforços e vários regressos no primeiro treino da pré-época|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/sporting-ja-trabalha-em-alcochete|publisher=Record|language=pt|date=3 July 2018|access-date=5 June 2021}}
{{cite news|title=Treinos a abrir já deixam marca|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/treinos-a-abrir-ja-deixam-marca|publisher=Record|language=pt|date=6 July 2018|access-date=5 June 2021}}
{{cite news|title=A crónica do Sporting-St. Lausanne, 4-1: Leão rugiu enquanto o cérebro mandou|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/a-cronica-do-sporting-st-lausanne-4-1-leao-rugiu-enquanto-o-cerebro-mandou|publisher=Record|language=pt|date=17 July 2018|access-date=5 June 2021}}
He continued to expect to leave the club over the summer despite making his return.{{cite news|title=Ataque espera Leão e mais um|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/ataque-espera-leao-e-mais-um|publisher=Record|language=pt|date=22 July 2018|access-date=5 June 2021}}
{{cite news|title=Mais sete estão de saída do Sporting|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/mais-sete-estao-de-saida|publisher=Record|language=pt|date=26 July 2018|access-date=5 June 2021}}
{{cite news|title=Só falta acertar forma de pagamento de Diaby|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/so-falta-acertar-forma-de-pagamento-de-diaby|publisher=Record|language=pt|date=12 August 2018|access-date=5 June 2021}}
Amid the transfer speculation, Castaignos made his appearance for Sporting CP in over a year, coming on as a late substitute, in a 1–1 draw against rivals, Benfica on 25 August 2018.{{cite news|title=Castaignos e Gauld cobiçados|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/castaignos-e-gauld-cobicados|publisher=Record|language=pt|date=25 August 2018|access-date=5 June 2021}}
{{cite news|title=Os jogadores do Sporting um a um: Muralha francesa|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/os-jogadores-do-sporting-um-a-um-muralha-francesa|publisher=Record|language=pt|date=26 August 2018|access-date=5 June 2021}}
Eventually, he ended up staying at the club when the transfer window closed.{{cite news|title=Castaignos deve sair|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/castaignos-deve-sair|publisher=Record|language=pt|date=31 August 2018|access-date=5 June 2021}}
{{cite news|title=Sporting falha contratação de um ponta-de-lança|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/sporting-falha-contratacao-de-um-ponta-de-lanca|publisher=Record|language=pt|date=31 August 2018|access-date=5 June 2021}}
Following this, Castaignos continued to find his first team opportunities limited and was placed on the substitute bench.{{cite news|title=Gudelj e Diaby na lista do Sporting para a Liga Europa|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/gudelj-e-diaby-na-lista-do-sporting-para-a-liga-europa|publisher=Record|language=pt|date=4 September 2018|access-date=5 June 2021}}
{{cite news|title=Castaignos e Diaby não convencem|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/castaignos-e-diaby-nao-convencem|publisher=Record|language=pt|date=13 February 2018|access-date=5 June 2021}}
{{cite news|title=Castaignos ainda por resolver|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/castaignos-ainda-por-resolver|publisher=Record|language=pt|date=21 January 2019|access-date=5 June 2021}}
He went on to make three appearances for the club in the 2018–19 season.{{cite news|title=A crónica do Sporting-Feirense (1-0): a arma do costume|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/detalhe/a-cronica-do-sporting-feirense-1-0-a-arma-do-costume|publisher=Record|language=pt|date=2 September 2018|access-date=5 June 2021}}
{{cite news|title=A crónica do Sp. Braga-Sporting, 1-0: Alta definição|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/a-cronica-do-sp-braga-sporting-1-0-alta-definicao|publisher=Record|language=pt|date=25 September 2018|access-date=5 June 2021}}
{{cite news|title=O Loures só complicou enquanto o Sporting deixou|url=https://www.publico.pt/2018/10/20/desporto/cronica_de_jogo/bruno-fernandes-nani-garantem-apuramento-sporting-1848329 |publisher=Publico|language=pt|date=20 October 2018|access-date=5 June 2021}}
It was announced on 19 February 2019 that Castaignos left Sporting CP by mutual consent after months of speculation over his future at the club.{{cite news|title=Vários candidatos à saída|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/varios-candidatos-a-saida|publisher=Record|language=pt|date=18 November 2018|access-date=5 June 2021}}
{{cite news|title=Ataque do Sporting pode receber mais um reforço|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/ataque-pode-receber-mais-um-reforco|publisher=Record|language=pt|date=28 December 2018|access-date=5 June 2021}}
{{cite news|title=Castaignos ainda é problema|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/castaignos-ainda-e-problema|publisher=Record|language=pt|date=16 February 2019|access-date=5 June 2021}}
{{cite news|title=Sporting rescinde contrato com Luc Castaignos|url=https://www.publico.pt/2019/02/19/desporto/noticia/sporting-rescinde-contrato-luc-castaignos-1862496|publisher=Publico|language=pt|date=19 February 2019|access-date=5 June 2021}}
It was reported in the Portuguese media that Castaignos cost Sporting CP10,000 euros for every minutes he played in the competition.{{cite news|title=Castaignos custa 10 mil euros por cada minuto de competição|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/castaignos-custa-10-mil-euros-por-cada-minuto-de-competicao|publisher=Record|language=pt|date=2 February 2019|access-date=5 June 2021}}

==Vitesse (loan)==

On 7 August 2017, Castaignos returned to the Netherlands to join Vitesse on a season-long loan.{{Cite news|title=Castaignos strengthens Vitesse|url=https://www.vitesse.nl/nl/nieuws/detail/6609/castaignos-versterkt-vitesse|publisher=SBV Vitesse Official Site|language=nl|date=7 August 2017|access-date=7 August 2017|archiveurl=https://web.archive.org/web/20210603195802/https://www.vitesse.nl/nl/nieuws/detail/6609/castaignos-versterkt-vitesse|archive-date=3 June 2021|url-status=dead}} It came after when Sporting CP expected the player to leave in the summer.{{cite news|title=Quatro no mercado para fazer 10 milhões|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/quatro-no-mercado-para-fazer-10-milhoes|publisher=Record|language=pt|date=13 April 2017|access-date=5 June 2021}}
{{cite news|title=Seis jogadores na porta de saída do Sporting|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/seis-jogadores-na-porta-de-saida-de-alvalade|publisher=Record|language=pt|date=17 May 2017|access-date=5 June 2021}}

He made his debut for the club, coming on as a 78th-minute substitute, in a 4–1 win against NAC Breda in the opening game of the season.{{cite news|title=Nieuwelingen Vitesse draaien zwak NAC de nek om|url=https://www.fcupdate.nl/voetbalnieuws/320145/nieuwelingen-vitesse-draaien-zwak-nac-de-nek-om/|publisher=FC Update|language=nl|date=12 August 2017|access-date=5 June 2021}} Since joining Vitesse, Castaignos found his playing time, coming on from the substitute bench and competed with Tim Matavž over the first choice striker role.{{cite news|title=Castaignos lacht weer: "Ik was het plezier een tijdje kwijt"|url=https://www.fcupdate.nl/voetbalnieuws/320779/castaignos-lacht-weer-ik-was-het-plezier-een-tijdje-kwijt/|publisher=FC Update|language=nl|date=26 August 2017|access-date=5 June 2021}}
{{cite news|title=Vitesse met Rashica en Kashia, De Vrij in de basis bij Lazio|url=https://www.fcupdate.nl/voetbalnieuws/321607/vitesse-met-rashica-en-kashia-de-vrij-in-de-basis-bij-lazio/|publisher=FC Update|language=nl|date=14 September 2017|access-date=5 June 2021}}
{{cite news|title=Vitesse met Castaignos en Mount tegen Zulte Waregem|url=https://www.fcupdate.nl/voetbalnieuws/323933/vitesse-met-castaignos-en-mount-tegen-zulte-waregem/|publisher=FC Update|language=nl|date=2 November 2017|access-date=5 June 2021}}
{{cite news|title=Castaignos: "Ik heb meer minuten gemaakt dan bij Sporting"|url=https://www.fcupdate.nl/voetbalnieuws/327111/castaignos-ik-heb-meer-minuten-gemaakt-dan-bij-sporting/|publisher=FC Update|language=nl|date=11 January 2018|access-date=5 June 2021}}
{{cite news|title=Schorsing van Matavz biedt Castaignos kansen bij Vitesse|url=https://www.fcupdate.nl/voetbalnieuws/328336/schorsing-van-matavz-biedt-castaignos-kansen-bij-vitesse/|publisher=FC Update|language=nl|date=7 February 2018|access-date=5 June 2021}}
He spoke out about his place in the first team, saying: "I had to be patient, waited a long time. But everything is happening as it should happen. In moments like this I have to take my chance."{{cite news|title=Castaignos stevent af op basisplek: "Moet kans pakken"|url=http://www.fcupdate.nl/voetbalnieuws/323121/castaignos-stevent-af-op-basisplek-moet-kans-pakken/|publisher=FC Update|language=nl|date=17 October 2017|access-date=5 June 2021}}
{{cite news|title=Fraser: "Castaignos moet duidelijk in bepaald ritme komen"|url=https://www.fcupdate.nl/voetbalnieuws/323236/fraser-castaignos-moet-duidelijk-in-bepaald-ritme-komen/|publisher=FC Update|language=nl|date=19 October 2017|access-date=5 June 2021}}
{{cite news|title=Teruggekeerde Matavz verdringt Castaignos uit basis|url=https://www.fcupdate.nl/voetbalnieuws/329469/teruggekeerde-matavz-verdringt-castaignos-uit-basis/|publisher=FC Update|language=nl|date=2 March 2018|access-date=5 June 2021}}
{{cite news|title=Fraser dreigt Castaignos ook bij afwezigheid Matavz te passeren|url=https://www.fcupdate.nl/voetbalnieuws/330788/fraser-dreigt-castaignos-ook-bij-afwezigheid-matavz-te-passeren/|publisher=FC Update|language=nl|date=30 March 2018|access-date=5 June 2021}}
Castaignos then scored his first goal for the club, in a 3–0 win against Excelsior on 9 September 2017.{{cite web|url=https://www.vitesse.nl/nl/nieuws/detail/6658/vitesse-wint-uitwedstrijd-vs-excelsior-0-3|title=VITESSE WINT UITWEDSTRIJD VS EXCELSIOR: 0-3|publisher=SBV Vitesse Official Site|language=nl|date=9 September 2017|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20210603202142/https://www.vitesse.nl/nl/nieuws/detail/6658/vitesse-wint-uitwedstrijd-vs-excelsior-0-3|archive-date=3 June 2021|url-status=dead}} However, he suffered a concussion in a match against Zulte Waregem in the UEFA Europa League match on 2 November 2017 and was substituted in the 35th minute, as the club lost 2–0.{{cite web|url=https://www.vitesse.nl/nl/nieuws/detail/6779/vitesse-verliest-in-eigen-huis|title=VITESSE VERLIEST IN EIGEN HUIS|publisher=SBV Vitesse Official Site|language=nl|date=2 November 2017|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20210603203024/https://www.vitesse.nl/nl/nieuws/detail/6779/vitesse-verliest-in-eigen-huis|archive-date=3 June 2021|url-status=live}}
{{cite news|title=Hersenschudding voor Castaignos|url=https://www.rijnmond.nl/nieuws/160986/Hersenschudding-voor-Castaignos|publisher=RTV Rijnmond|language=nl|date=3 November 2017|access-date=5 June 2021}}
After missing one match, Castaignos returned to the first team from injury, coming on as an 83rd-minute substitute, in a 4–2 loss against FC Groningen on 19 November 2017.{{cite news|title=Eigen goal Vitesse gaat de wereld over tijdens spectaculaire zege Groningen|url=https://www.vi.nl/nieuws/eigen-goal-vitesse-gaat-de-wereld-over-tijdens-spectaculaire-zege-groningen|publisher=Voetbal International|language=nl|date=19 November 2017|access-date=5 June 2021}} Three weeks later on 7 December 2017, he scored his second goal for Vitesse, in a 1–0 win against OGC Nice in the UEFA Europa League Group Stage.{{cite web|url=https://www.vitesse.nl/nl/nieuws/detail/6853/vitesse-sluit-europees-avontuur-winnend-af|title=VITESSE SLUIT EUROPEES AVONTUUR WINNEND AF|publisher=SBV Vitesse Official Site|language=nl|date=7 December 2017|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20210603202934/https://www.vitesse.nl/nl/nieuws/detail/6853/vitesse-sluit-europees-avontuur-winnend-af|archive-date=3 June 2021|url-status=live}} After going two months without scoring, Castaignos finally scored his third goal for the club, in a 2–1 loss against Excelsior on 17 February 2018.{{cite news|title=Fraser hard over falende Castaignos: "Dit is topsport"|url=https://www.fcupdate.nl/voetbalnieuws/328452/fraser-hard-over-falende-castaignos-dit-is-wel-topsport/|publisher=FC Update|language=nl|date=9 February 2018|access-date=5 June 2021}}
{{cite web|url=https://www.vitesse.nl/nl/nieuws/detail/6998/vitesse-weet-de-goede-lijn-niet-door-te-trekken|title=VITESSE WEET DE GOEDE LIJN NIET DOOR TE TREKKEN|publisher=SBV Vitesse Official Site|language=nl|date=17 February 2018|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20210603202607/https://www.vitesse.nl/nl/nieuws/detail/6998/vitesse-weet-de-goede-lijn-niet-door-te-trekken|archive-date=3 June 2021|url-status=live}}
{{cite news|title=Goal Castaignos niets waard na defensieve fouten Vitesse|url=https://www.fcupdate.nl/voetbalnieuws/328843/goal-castaignos-niets-waard-na-defensieve-fouten-vitesse/|publisher=FC Update|language=nl|date=17 February 2018|access-date=5 June 2021}}
He played in both legs of the play-off against FC Utrecht and helped Vitesse win 5–3 on aggregate to qualify for the UEFA Europa League next season.{{cite news|title=Vitesse ruikt voorronde Europa League dankzij late goal Kashia|url=https://www.fcupdate.nl/voetbalnieuws/332903/vitesse-ruikt-voorronde-europa-league-dankzij-late-goal-kashia/|publisher=FC Update|language=nl|date=15 May 2018|access-date=5 June 2021}}
{{cite news|title=Vitesse mag door in de strijd om Europees voetbal|url=https://www.nrc.nl/nieuws/2018/05/19/vitesse-mag-door-in-de-strijd-om-europees-voetbal-a1603580|work=NRC Handelsblad|language=nl|date=19 May 2018|access-date=5 June 2021}}
At the end of the 2017–18 season, Castaignos went on to make 36 appearances and scoring three times in all competitions. Following this, he returned to his parent club.{{cite web|url=https://www.vitesse.nl/nl/nieuws/detail/7071/aflopende-contracten|title=AFLOPENDE CONTRACTEN|publisher=SBV Vitesse Official Site|language=nl|date=29 March 2018|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20201205140801/https://www.vitesse.nl/nl/nieuws/detail/7071/aflopende-contracten|archive-date=5 December 2020|url-status=live}}

=Gyeongnam FC=

On 20 February 2019, Castaignos officially joined South Korean K League 1 football club Gyeongnam FC.{{Cite news |title=경남, 인테르 출신 룩 카스타이노스 영입 발표|url=https://sports.naver.com/kfootball/news/read.nhn?oid=139&aid=0002104609 |publisher=Sportal Korea|language=ko|date=20 February 2019|access-date=20 February 2019}}
{{cite news|title= 경남FC, '중국행'말컹 대체자로 FW 카스타이노스 영입|url=https://www.goal.com/kr/%EB%89%B4%EC%8A%A4/a/1ofe226ji1vv11ahndwgarbuka|publisher=Goal.com|language=ko|date=20 February 2019|access-date=5 June 2021}}
{{cite news|title=경남, 유럽파 '장신 공격수' 룩 카스타이노스 영입|url=http://osen.mt.co.kr/article/G1111084706|publisher=Osen|language=ko|date=20 February 2019|access-date=5 June 2021}}
Upon joining the club, he said: "I am delighted to be joining Gyeongnam. I am looking forward to living in Gyeongnam, and I want to meet the fans at the stadium as soon as possible. "

Castaignos made his debut for the club, coming on as a 62nd-minute substitute, in a 2–1 win against Seongnam in the opening game of the season.{{cite news|title='김승준-쿠니모토 연속골' 경남, 성남에 2-1 승|url=http://osen.mt.co.kr/article/G1111091221|publisher=Osen|language=ko|date=1 March 2019|access-date=5 June 2021}}
{{cite news|title=[현장 분석] EPL-인터밀란 출신도 아닌 김승준이 '깜짝 주인공'|url=http://sports.hankooki.com/lpage/soccer/201903/sp2019030117522593650.htm|publisher=Sports Hankooki|language=ko|date=1 March 2019|access-date=5 June 2021}}
In a follow–up match against Shandong Luneng in the AFC Champions League, he set up a goal for Kim Seung-jun, in a 2–2 draw.{{cite news|title= '전반과 달랐던 후반'…경남의 아쉬운 무승부|url=https://www.nocutnews.co.kr/news/5113969|publisher=Nocut News|language=ko|date=5 March 2019|access-date=5 June 2021}}
{{cite news|title=잘 싸웠다…경남, ACL 첫 경기 산둥전 2-2 무승부[현장리뷰]|url=http://www.sportsseoul.com/news/read/735190|publisher=Sports Seoul|language=ko|date=5 March 2019|access-date=5 June 2021}}
However, Castaignos suffered a knee injury and was substituted at half time, as Gyeongnam won 2–1 against Daegu on 30 March 2019.{{cite news|title=서울, 자책골에 꺾인 상주에 2-0 승리…선두 탈환 & 4경기 무패(종합) |url=https://www.yna.co.kr/view/AKR20190330040151007?input=1195m|publisher=Yunhap News|language=ko|date=30 March 2019|access-date=5 June 2021}} As a result, he was sidelined for two months.{{cite news|title=경남FC-가시마 우라와-전북현대, '한일전' 부상이슈? [아시아 챔피언스리그 프리뷰]|url=http://www.sportsq.co.kr/news/articleView.html?idxno=326615|publisher=Sports Q|language=ko|date=9 April 2019|access-date=5 June 2021}}
{{cite news|title=도민프로축구단 경남FC, 강등걱정해야하나|url=http://www.knnews.co.kr/news/articleView.php?idxno=1285895|publisher=K News|language=ko|date=6 May 2019|access-date=5 June 2021}}
{{cite news|title=머치 마저 전력이탈…부상에 우는 경남FC|url=https://sports.donga.com/3/all/20190513/95499644/1|publisher=Sports Donga|language=ko|date=13 May 2019|access-date=5 June 2021}}
Castaignos made his return from injury against Johor Darul Ta'zim on 22 May 2019 and scored his first goal for the club, in a 2–0 win.{{cite news|title=기적 노리는 경남, 룩-네게바-쿠니모토 선발 가동|url=http://www.sportsseoul.com/news/read/766401|publisher=Sports Seoul|language=ko|date=22 May 2019|access-date=5 June 2021}}
{{cite news|title= '마침내 터진' 경남 비밀병기 룩, 역시 한 방 있었다|url=https://www.besteleven.com/Country/news_01_view.asp?iBoard=8&iIDX=119856|publisher=Best Eleven|language=ko|date=22 May 2019|access-date=5 June 2021}}
{{cite news|title=경남FC-대구FC, ACL 조별리그 탈락…K리그 4룡 동반 16강 진출 실패|url=http://www.sportsseoul.com/news/read/766557|publisher=Sports Seoul|language=ko|date=22 May 2019|access-date=5 June 2021}}
After missing a match due to being given a personal leave, he scored two goals in two matches between 15 June 2019 and 22 June 2019 against Seongnam and Incheon United.{{cite news|title='Again 개막전' 경남FC, 성남 상대 승리 예고|url=http://stoo.asiae.co.kr/article.php?aid=55465927846|publisher=Stoo Asiae|language=ko|date=12 June 2019|access-date=5 June 2021}}
{{cite news|title='에델 동점골' 성남, 수적 열세 딛고 경남과 1-1 무승부|url=https://www.sports-g.com/2019/06/15/에델-동점골-성남-수적-열세-딛고-경남과-1-1-무승|publisher=Sports G|language=ko|date=15 June 2019|access-date=5 June 2021}}
{{cite news|title='강등 전쟁' 경남-인천, 1-1 무승부|url=http://osen.mt.co.kr/article/G1111170030|publisher=Osen|language=ko|date=22 June 2019|access-date=5 June 2021}}
{{cite news|title=경남FC, 연이은 무승부가 아쉬운 이유는? |url=https://sports.donga.com/3/all/20190623/96141695/2|publisher=Sports Donga|language=ko|date=23 June 2019|access-date=5 June 2021}}
After suffering another injury, Castaignos then scored his fourth goal for Gyeongnam, in a 2–2 draw against Jeju United on 22 July 2019.{{cite news|title= [SPO CRITIC] 끝없는 경남의 추락, 무엇이 문제인가|url=http://www.spotvnews.co.kr/?mod=news&act=articleView&idxno=300496|publisher=Spotv News|language=ko|date=4 July 2019|access-date=5 June 2021}}
{{cite news|title= '우중혈투' 경남, 제리치 선제골에도 제주와 2-2...18경기 무승|url=https://www.chosun.com/site/data/html_dir/2019/07/20/2019072001442.html|publisher=Chosun|language=ko|date=20 July 2019|access-date=5 June 2021}}
Despite the injuries, he continued to remain involved in the first team throughout the 2019 season.{{cite news|title=브라질 vs 유럽 누가 더 셀까…대구-경남 '외인 대결' 주목|url=https://www.yna.co.kr/view/AKR20190329111500007?input=1195m|publisher=Yunhap News|language=ko|date=29 March 2019|access-date=5 June 2021}}
{{cite news|title= [엠스플 현장] '14경기 무승' 경남, 시즌 첫 무실점도 소용없었다 |url=https://www.mbcsportsplus.com/news/index.php?mode=view&cate=29&b_idx=99842854.000|publisher=MBS Sports Plus|language=ko|date=29 June 2019|access-date=5 June 2021}}
{{cite news|title=머치 복귀한 경남, 올라갈 일만 남았다? |url=https://sports.donga.com/3/all/20190630/96254090/1|publisher=Sports Donga|language=ko|date=30 June 2019|access-date=5 June 2021}}
{{cite news|title= [엠스플 현장] '제리치 연속골' 경남 "오스만·쿠니모토 돌아오면 공격력 살아날 것"|url=https://www.mbcsportsplus.com/news/index.php?mode=view&cate=29&b_idx=99838391.000 |publisher=MBC Sports Plus|language=ko|date=30 July 2019|access-date=5 June 2021}}
{{cite news|title= [이근승의 킥앤러시] '준우승->강등' 경남은 교훈을 남기고 떠났다|url=https://www.mbcsportsplus.com/news/index.php?mode=view&cate=29&b_idx=99822692.000|publisher=MBC Sports Plus|language=ko|date=26 December 2019|access-date=5 June 2021}}
However, the club ended up relegated to K League 2 after losing 2–0 to Busan IPark on aggregate on 8 December 2019.{{cite news|title=실패로 끝난 경남FC의 폭풍 개편…K리그2 강등으로|url=https://sports.donga.com/3/all/20191208/98709665/1|publisher=Sports Donga|language=ko|date=8 December 2019|access-date=5 June 2021}} At the end of the 2019 season, Castaignos made 26 appearances and scoring four times in all competitions.

However, the 2020 season was pushed back to May because of the pandemic.{{cite news|title=Veldwijk en Castaignos voorlopig niet in actie door coronavirus|url=https://www.rijnmond.nl/nieuws/192380/Veldwijk-en-Castaignos-voorlopig-niet-in-actie-door-coronavirus|publisher=RTV Rijnmond|language=nl|date=24 February 2020|access-date=5 June 2021}} He also stayed at Gyeongnam despite the club's relegation.{{cite news|title= '발 빠른 경남' 제리치-룩 남고, 김효기 광주로 떠난다|url=http://www.spotvnews.co.kr/?mod=news&act=articleView&idxno=337589|publisher=Spotv News|language=ko|date=4 January 2020|access-date=5 June 2021}}
{{cite news|title=계륵이 된 룩, 설기현 감독의 활용방안은?|url=https://sports.donga.com/article/all/20200531/101291972/1|publisher=Sports Donga|language=ko|date=31 May 2020|access-date=5 June 2021}}
Castaignos made his first appearance of the season, coming on as 78th-minute substitute, in a 0–0 draw against Ansan Greeners on 20 July 2020.{{cite news|title=안산, 경남과 득점 없이 0-0 무…리그 4경기 연속 무승|url=https://www.sports-g.com/2020/07/20/안산-경남과-득점-없이-0-0-무리그-4경기-연속-무|publisher=Sports G|language=ko|date=20 July 2020|access-date=5 June 2021}} In a follow–up match against Jeonnam Dragons, he scored his first goal of the season, in a 1–1 draw.{{cite news|title=경남FC, 아쉬운 무승부 속 반가운 룩의 득점|url=https://sports.donga.com/article/all/20200727/102175732/2|publisher=Sports Donga|language=ko|date=27 July 2020|access-date=5 June 2021}} Castaignos scored his second goal of the season, in a 3–3 draw against Jeju United on 5 September 2020, in what turned out to be his last appearance for Gyeongnam.{{cite news|title= K리그2 선두 제주, 막판 실점으로 경남과 무승부|url=https://newsis.com/view/?id=NISX20200905_0001155785|publisher=Newsis|language=ko|date=5 September 2020|access-date=5 June 2021}} On 21 September 2020, the club announced that they have terminated his contract by mutual consent, with manager Seol Ki-hyeon claiming that the player fell out with the management.{{cite news|title=경남FC, '계륵' 룩과 계약해지|url=http://www.knnews.co.kr/news/articleView.php?idxno=1334321|publisher=KN News|language=ko|date=21 September 2020|access-date=5 June 2021}}
{{cite news|title=경남FC, 2년간 5골 기록한 룩과 계약 해지...10억 연봉, 한 골당 약 4억|url=http://www.mhns.co.kr/news/articleView.html?idxno=417532|publisher=MHNS|language=ko|date=22 September 2020|access-date=5 June 2021}}
By the time he departed from Gyeongnam, Castaignos made eight appearances and scoring two times in all competitions.

=OFI=

On 21 January 2021, Castaignos agreed a move to Greek club OFI.{{cite news|title=ΟΦΗ: Συμφώνησε με τον Καστάνιος|url=https://www.sport24.gr/football/ofi-symfonise-me-ton-kastainios.9118198.html|publisher=Sport 24|language=el|date=21 January 2021|access-date=5 June 2021}} The move was confirmed on 25 January 2021, with the player signed a two–year contract, keeping him until 2023.{{Cite web|date=2021-01-25|title=Castaignos continues his career in Greece|url=http://www.football-oranje.com/castaignos-continues-his-career-in-greece/|access-date=2021-01-26|website=Football Oranje|language=en-US}}
{{cite news|title=ΟΦΗ: Ανακοίνωσε τον Καστάνιος|url=https://www.sport24.gr/football/ofi-kastanios-super-league-metagrafi.9122642.html|publisher=Sport 24|language=el|date=25 January 2021|access-date=5 June 2021}}
Upon joining the club, he said: "I was surprised by the way I played with total football."{{cite news|title=Καστάνιος: "Με εξέπληξε ο τρόπος παιχνιδιού με το ολοκληρωτικό ποδόσφαιρο"|url=https://www.sport24.gr/football/ofi-kastanios-ellada-super-league.9122881.html|publisher=Sport 24|language=el|date=25 January 2021|access-date=5 June 2021}}

Castaignos made his debut for OFI, coming on as an 82nd-minute substitute, in a 2–0 loss against AEK Athens on 31 January 2021.{{cite news|title=ΟΦΗ - ΑΕΚ 0-2 (vids)|url=https://www.gazzetta.gr/football/superleague/article/1559642/ofi-aek-0-2-vids|publisher=Gazzetta.gr|language=el|date=31 January 2021|access-date=5 June 2021}}
{{cite news|title=ΟΦΗ - ΑΕΚ 0-2: "Κιτρινόμαυρη" αντίδραση και δεύτερη θέση|url=https://www.sport24.gr/football/ofi-aek-0-2-kitrinomayri-antidrasi-kai-deyteri-thesi.9128336.html|publisher=Sport 24|language=el|date=31 January 2021|access-date=5 June 2021}}
He then scored his first goal for the club, in a 2–1 loss against Volos two weeks later on 14 February 2021.{{cite news|title=ΟΦΗ - Βόλος 1-2: Διπλό στο Ηράκλειο και επιστροφή στις νίκες|url=https://www.sport24.gr/football/ofi-volos-1-2-diplo-sto-irakleio-kai-epistrofi-stis-nikes.9143400.html|publisher=Sport 24|language=el|date=14 February 2021|access-date=5 June 2021}} However, Castaignos suffered a leg injury that saw him sidelined between four and six weeks.{{cite news|title=ΟΦΗ: Πλήγμα με Καστάνιος|url=https://www.sport24.gr/football/ofi-pligma-me-kastanios.9186449.html|publisher=Sport 24|language=el|date=30 March 2021|access-date=5 June 2021}} But he made his return from injury, coming on as a second-half substitute, in a 2–2 draw against Panetolikos in the last game of the season.{{cite news|title=ΟΦΗ - Παναιτωλικός 2-2 (vids)|url=https://www.gazzetta.gr/football/superleague/article/1593356/ofi-panaitolikos-2-2-vids|publisher=Gazzetta.gr|language=el|date=15 May 2021|access-date=5 June 2021}} At the end of the 2020–21 season, Castaignos made eight appearances and scoring once in all competitions.

=1. FC Magdeburg=

Castaignos joined 2. Bundesliga club 1. FC Magdeburg as a free agent in January 2023, after a trial.{{cite web|publisher=1. FC Magdeburg|url=https://1.fc-magdeburg.de/aktuelles/profis/fcm-verpflichtet-luc-castaignos/9822|title=FCM verpflichtet Luc Castaignos|date=18 January 2023|access-date=22 January 2023|language=de|archive-date=18 January 2023|archive-url=https://web.archive.org/web/20230118200950/https://1.fc-magdeburg.de/aktuelles/profis/fcm-verpflichtet-luc-castaignos/9822|url-status=dead}} He left Magdeburg at the end of the 2023–24 season.{{cite web|publisher=1. FC Magdeburg|url=https://1.fc-magdeburg.de/news/detail/fcm-verabschiedet-fuenf-spieler|title=FCM VERABSCHIEDET FÜNF SPIELER|trans-title=FCM SAYS GOODBYE TO FIVE PLAYERS|date=15 May 2024|access-date=3 July 2024|language=de}}

International career

Castaignos is eligible to play for France through his parents and Netherlands through his place of birth, but he opted to play for Netherlands.{{cite news|title=Castaignos: ooit kiezen tussen Nederlands en Frans elftal|url=https://feyenoord.supporters.nl/nieuws/artikel/21989/Castaignos-ooit-kiezen-tussen-Nederlands-en-Frans-elftal|publisher=Feyenoord Supporters News|language=nl|date=11 August 2010|access-date=5 June 2021}}

=Early youth career=

In September 2008, Castaignos was called up to the Netherlands U17 for the first time when he was fifteen years old and made his first international appearance on 18 September 2008 in a friendly match of the Netherlands U17, in a 0–0 draw against Spain U17.{{cite news|title=Nederland O17 0–0 Spanje O17|url=https://www.onsoranje.nl/teams/184965/programma/wedstrijd/7174|publisher=Ons Oranje|language=nl|date=17 September 2008|access-date=5 June 2021}} In a follow–up match against Germany U17 on 25 September 2008, Castaignos scored his first goal for the U17 national team, in a 2–1 win.{{cite news|title=Duitsland O17 1–2 Nederland O17|url=https://www.onsoranje.nl/teams/184965/uitslagen/wedstrijd/7566|publisher=Ons Oranje|language=nl|date=25 September 2008|access-date=5 June 2021}} Two weeks later on 8 October 2008, he scored his second goal for Netherlands U17, in a 2–0 win against Poland U17.{{cite news|title=Nederland O17 2–0 Polen O17|url=https://www.onsoranje.nl/teams/184965/uitslagen/wedstrijd/8510|publisher=Ons Oranje|language=nl|date=8 October 2008|access-date=5 June 2021}} Castaignos scored his first brace in his U17 national team, in a 2–2 draw against Norway U17 on 8 February 2009.{{cite news|title=Noorwegen O17 2–2 Nederland O17|url=https://www.onsoranje.nl/teams/184965/uitslagen/wedstrijd/11030|publisher=Ons Oranje|language=nl|date=8 February 2009|access-date=5 June 2021}} He added four more goals throughout the UEFA European Under-17 Championship elite round, including a brace against Luxembourg U17 on 21 March 2009.{{cite news|title=Nederland O17 2–2 Hongarije O17|url=https://www.onsoranje.nl/teams/184965/uitslagen/wedstrijd/11482|publisher=Ons Oranje|language=nl|date=4 March 2009|access-date=5 June 2021}}
{{cite news|title=Luxemburg O17 0–4 Nederland O17|url=https://www.onsoranje.nl/teams/184965/uitslagen/wedstrijd/11510|publisher=Ons Oranje|language=nl|date=21 March 2009|access-date=5 June 2021}}
{{cite news|title=Nederland O17 3–0 Kroatië O17|url=https://www.onsoranje.nl/teams/184965/uitslagen/wedstrijd/11538|publisher=Ons Oranje|language=nl|date=24 March 2009|access-date=5 June 2021}}

In April 2009, Castaignos was called up to the Netherlands U17 squad for the UEFA European Under-17 Football Championship in Germany.{{cite web|url=http://www.onsoranje.nl/news/content/news/oranje/onder-17/Selectie-Onder-17-voor-EK-2009.html|title=Feyenoord kleurt EK-selectie O-17|publisher=Ons Oranje|language=nl|date=23 April 2009|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20090426230640/http://www.onsoranje.nl/news/content/news/oranje/onder-17/Selectie-Onder-17-voor-EK-2009.html|archive-date=26 April 2009|url-status=dead}} He played his first match of the tournament, starting the whole game, in a 1–1 draw against England U17 on 6 May 2009.{{cite news|title=Engeland O17 1–1 Nederland O17|url=http://www.onsoranje.nl/teams/184965/uitslagen/wedstrijd/11626|publisher=Ons Oranje|language=nl|date=6 May 2009|access-date=5 June 2021}} Three days later on 9 May 2009, Castaignos scored his first goal of the tournament, in a 2–1 win against Turkey U17.{{cite news|title=Turkije O17 1–2 Nederland O17|url=https://www.onsoranje.nl/teams/184965/uitslagen/wedstrijd/11622|publisher=Ons Oranje|language=nl|date=9 May 2009|access-date=5 June 2021}} He scored his second goal of the tournament, in the semi–finals of the UEFA European Under-17 Football Championship, in a 2–1 win against Switzerland U17 to reach the final.{{cite news|title=Zwitserland O17 1–2 Nederland O17|url=https://www.onsoranje.nl/teams/184965/uitslagen/wedstrijd/11678|publisher=Ons Oranje|language=nl|date=15 May 2009|access-date=5 June 2021}}
{{cite news|title=O-17 'SEHR FROH' MET FINALEPLAATS|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-17/1106/o-17-sehr-froh-met-finaleplaats|publisher=Ons Oranje|language=nl|date=16 May 2011|access-date=5 June 2021}}
In the final against Germany U17, Castaignos scored the opening goal of the game, as the Dutch team, aided by a strong contingent of seven Feyenoord players in the squad, finished second after losing 2–1 the final to in extra-time.{{cite news|title=Germany secure maiden U17 crown|url=http://www.uefa.com/competitions/under17/fixturesresults/round=15210/match=2001173/report=rp.html|newspaper=UEFA|date=18 May 2009|access-date=26 September 2009|url-status=dead|archive-url=https://web.archive.org/web/20090814043850/http://www.uefa.com/competitions/under17/fixturesresults/round%3D15210/match%3D2001173/report%3Drp.html|archive-date=14 August 2009}} For his performance in tournament, he was considered one of the key players in the team,{{cite news|title=Grand Duchy prepares for Elite test|url=http://www.uefa.com/competitions/under17/news/kind=1/newsid=811175.html|newspaper=UEFA|date=18 March 2009|access-date=26 September 2009|url-status=dead|archive-url=https://web.archive.org/web/20090607204920/http://www.uefa.com/competitions/under17/news/kind%3D1/newsid%3D811175.html|archive-date=7 June 2009}} picked up the tournament's top scorer award alongside Lennart Thy{{cite news|title=Castaignos and Thy share scorers' prize|url=http://www.uefa.com/competitions/under17/news/kind=1/newsid=830780.html|newspaper=UEFA |date=18 May 2009|access-date=26 September 2009|url-status=dead|archive-url=https://web.archive.org/web/20091001010005/http://www.uefa.com/competitions/under17/news/kind%3D1/newsid%3D830780.html|archive-date=1 October 2009}}
{{cite web|url=http://www.uefa.com/competitions/under17/news/kind=1/newsid=830986.html|title=Award no consolation to crestfallen Castaignos|publisher=UEFA|date=18 May 2009|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20090521095135/http://www.uefa.com/competitions/under17/news/kind=1/newsid=830986.html|archive-date=21 May 2009|url-status=dead}}
and was mentioned in the team of the tournament.{{cite news|title=Ten future stars from 2009 finals|url=http://www.uefa.com/competitions/under17/news/kind=1/newsid=830804.html|newspaper=UEFA|date=19 May 2009|access-date=26 September 2009|url-status=dead|archive-url=https://web.archive.org/web/20090901075852/http://www.uefa.com/competitions/under17/news/kind%3D1/newsid%3D830804.html|archive-date=1 September 2009}}

Castaignos' international fame started to rise after the 2009 UEFA European Under-17 Football Championship in Germany and was called up to the Netherlands U17 squad for the FIFA U-17 World Cup in Nigeria.{{cite news|title=De Vries en Velder vallen af bij -17|url=https://www.rijnmond.nl/nieuws/22115/De-Vries-en-Velder-vallen-af-bij-17|publisher=RTV Rijnmond|language=nl|date=10 October 2009|access-date=5 June 2021}} He scored his first goal in the tournament, in a 2–1 win against Gambia U17 on 28 October 2009.{{cite news|title=Castaignos belangrijk voor Oranje -17|url=https://www.rijnmond.nl/nieuws/21638/Castaignos-belangrijk-voor-Oranje-17|publisher=RTV Rijnmond|language=nl|date=29 October 2009|access-date=5 June 2021}}
{{cite web|url=http://www.feyenoord.nl/pages/newsdetail/s1/10010000035230-999-10010000000003.aspx|title=WK-team op de voet gevolgd (III): Luc Castaignos|publisher=Feyenoord|language=nl|date=28 October 2009|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20091030120736/http://www.feyenoord.nl/pages/newsdetail/s1/10010000035230-999-10010000000003.aspx|archive-date=30 October 2009|url-status=dead}}
Castaignos played all three matches in the tournament, as he was unable to help the U17 national team reach further in the FIFA U-17 World Cup.{{cite news|title=VALSE START WK-TEAM ONDER 17|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-18/1822/valse-start-wk-team-onder-17|publisher=Ons Oranje|language=nl|date=25 October 2009|access-date=5 June 2021}}
{{cite news|title=WK-TEAM TUSSEN HOOP EN VREES|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-18/1782/wk-team-tussen-hoop-en-vrees|publisher=Ons Oranje|language=nl|date=31 October 2009|access-date=5 June 2021}}
With 13 goals, Castaignos is the all-time top scorer of the Netherlands U17.

=Netherlands U19=

In February 2010, Castaignos was called up to the Netherlands U19 for the first time.{{cite news|title=DE VRIJ, CASTAIGNOS BIJ ONDER 19|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/2610/de-vrij-castaignos-bij-onder-19|publisher=Ons Oranje|language=nl|date=18 February 2010|access-date=5 June 2021}}
{{cite news|title=OPROEP TEN VOORDE EN SCHOUTEN|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/2786/oproep-ten-voorde-en-schouten|publisher=Ons Oranje|language=nl|date=1 March 2010|access-date=5 June 2021}}
He made his debut for the U19 national team, starting a match and 73 minutes before being substituted, in a 1–1 win against England U19 on 2 March 2010.{{cite news|title=BURNET VOORKOMT NEDERLAAG ONDER 19|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/2842/burnet-voorkomt-nederlaag-onder-19|publisher=Ons Oranje|language=nl|date=3 March 2010|access-date=5 June 2021}} On 20 May 2010, Castaignos scored his first Netherlands U19 goals, in a 2–0 win against Poland U19.{{cite news|title=Castaignos trefzeker in Oranje|url=https://www.rijnmond.nl/nieuws/16045/Castaignos-trefzeker-in-Oranje|publisher=RTV Rijnmond|language=nl|date=20 May 2010|access-date=5 June 2021}}
{{cite news|title=CASTAIGNOS VELT TAAI POLEN|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/5598/castaignos-velt-taai-polen|publisher=Ons Oranje|language=nl|date=20 May 2010|access-date=5 June 2021}}

In July 2010, Castaignos was called up to the UEFA European Under-19 Championship in France.{{cite news|title=EK-SELECTIE ONDER 19 BEKEND|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/9498/ek-selectie-onder-19-bekend|publisher=Ons Oranje|language=nl|date=14 July 2010|access-date=5 June 2021}}
{{cite news|title=De Roon niet naar EK onder 19|url=https://www.rijnmond.nl/nieuws/14660/De-Roon-niet-naar-EK-onder-19|publisher=RTV Rijnmond|language=nl|date=16 July 2010|access-date=5 June 2021}}
He played all three matches, as the U19 national team were eliminated in the group stage.{{cite news|title=ZWAK EK-BEGIN ONDER 19|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/9682/zwak-ek-begin-onder-19|publisher=Ons Oranje|language=nl|date=18 July 2010|access-date=5 June 2021}}
{{cite web|url=http://oranje.netwerk.to/nieuws/artikel/1090_EK%20ONDER%2019%3A%20Belangrijke%20zege%20Oranje%20op%20Engeland%20.php|title=EK ONDER 19: Belangrijke zege Oranje op Engeland|publisher=Oranje Network|language=nl|date=21 July 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20100724070528/http://oranje.netwerk.to/nieuws/artikel/1090_EK%20ONDER%2019%3A%20Belangrijke%20zege%20Oranje%20op%20Engeland%20.php|archive-date=24 July 2010|url-status=dead}}
{{cite news|title=ONDER 19 GRIJPT OVERAL NAAST|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/9902/onder-19-grijpt-overal-naast|publisher=Ons Oranje|language=nl|date=24 July 2010|access-date=5 June 2021}}
Castaignos scored another brace for Netherlands U19, in a 2–2 draw against Germany U19 on 3 September 2010.{{cite news|title=ONDER 19 OP Z'N DUITS NAAR 2-2|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/12178/onder-19-op-z'n-duits-naar-2-2|publisher=Ons Oranje|language=nl|date=3 September 2010|access-date=5 June 2021}} A month later on 9 October 2010, he scored his third brace for the U19 national team, in a 3–0 win against Malta U19.{{cite news|title=DUBBELE WINST VOOR ONDER 19|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/14358/dubbele-winst-voor-onder-19|publisher=Ons Oranje|language=nl|date=9 October 2010|access-date=5 June 2021}} Castaignos later scored two more goals for Netherlands U19.{{cite news|title=ONDER 19 IMPONEERT TEGEN ENGELAND|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/22110/onder-19-imponeert-tegen-engeland|publisher=Ons Oranje|language=nl|date=29 March 2011|access-date=5 June 2021}}
{{cite news|title=ONDER 19 NIET NAAR EK IN ROEMENIË|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/24078/onder-19-niet-naar-ek-roemenië|publisher= Ons Oranje|language=nl|date=24 May 2011|access-date=5 June 2021}}

=Netherlands U21=

In August 2011, Castaignos was called up to the Netherlands U21 squad for the first time.{{cite news|title=DRIE DEBUTANTEN BIJ JONG ORANJE|url=https://www.onsoranje.nl/nieuws/jong-oranje/26402/drie-debutanten-bij-jong-oranje|publisher=Ons Oranje|language=nl|date=5 August 2011|access-date=5 June 2021}} He made his U21 national team debut, starting the whole game, in a 3–0 loss against Sweden U21 on 10 August 2011.{{cite news|title=CASTAIGNOS IN BASIS JO|url=https://www.onsoranje.nl/nieuws/jong-oranje/26638/castaignos-basis-jo|publisher=Ons Oranje|language=nl|date=10 August 2011|access-date=5 June 2021}}
{{cite news|title=JONG ORANJE FAALT IN ZWEDEN|url=https://www.onsoranje.nl/nieuws/jong-oranje/26662/jong-oranje-faalt-zweden|publisher=Ons Oranje|language=nl|date=10 August 2011|access-date=5 June 2021}}
Castaignos made two more appearances for the Netherlands U21 by the end of the year.{{cite news|title=STIEKEME ZEGE JONG ORANJE|url=https://www.onsoranje.nl/nieuws/jong-oranje/27514/stiekeme-zege-jong-oranje|publisher=Ons Oranje|language=nl|date=1 September 2011|access-date=5 June 2021}}
{{cite news|title=RUIME ZEGE JONG ORANJE|url=https://www.onsoranje.nl/nieuws/jong-oranje/27754/ruime-zege-jong-oranje|publisher=Ons Oranje|language=nl|date=6 September 2011|access-date=5 June 2021}}
In February 2012, he was called up to the Netherlands U20 for the first time.{{cite news|title=VOORLOPIGE SELECTIE BELOFTENELFTAL|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-beloftenelftal/33830/voorlopige-selectie-beloftenelftal|publisher=Ons Oranje|language=nl|date=15 February 2012|access-date=5 June 2021}}
{{cite news|title=BEKENDE NAMEN IN BELOFTENELFTAL|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-beloftenelftal/34246/bekende-namen-beloftenelftal|publisher=Ons Oranje|language=nl|date=24 February 2012|access-date=5 June 2021}}
Castaignos made his U20 national team debut, starting a match and played 70 minutes before being substituted, in a 3–0 win against Denmark U21 on 29 February 2012.{{cite news|title=BELOFTENELFTAL LANGS DENEMARKEN|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-beloftenelftal/34566/beloftenelftal-langs-denemarken|publisher=Ons Oranje|language=nl|date=29 February 2012|access-date=5 June 2021}}

After a year absence, Castaignos was called up to the Netherlands U21 squad for the first time on 31 July 2013.{{cite news|title=STUIVENBERG SELECTEERT 32 SPELERS|url=https://www.onsoranje.nl/nieuws/jong-oranje/52522/stuivenberg-selecteert-32-spelers|publisher=Ons Oranje|language=nl|date=31 July 2013|access-date=5 June 2021}} He made his first appearances for the U21 national team in over a year, coming on as a second-half substitute, in a 1–0 loss against Czech Republic U21 on 14 August 2013.{{cite news|title=JONG ORANJE VERLIEST IN TSJECHIË|url=https://www.onsoranje.nl/nieuws/jong-oranje/52830/jong-oranje-verliest-tsjechië|publisher=Ons Oranje|language=nl|date=14 August 2013|access-date=5 June 2021}} Castaignos scored his first goal for Netherlands U21 and setting up one of the goals, in a 4–0 win against Scotland U21 on 5 September 2013.{{cite news|title=JO: RUIME, MAAR MOEIZAME ZEGE|url=https://www.onsoranje.nl/nieuws/jong-oranje/53370/jo-ruime-maar-moeizame-zege|publisher=Ons Oranje|language=nl|date=5 September 2013|access-date=5 June 2021}} A month later on 10 October 2013, he scored a hat–trick and set up two goals, in a 6–0 win against Georgia U21.{{cite news|title=CASTAIGNOS GROTE MAN BIJ JO|url=https://www.onsoranje.nl/nieuws/jong-oranje/54278/castaignos-grote-man-bij-jo|publisher=Ons Oranje|language=nl|date=10 October 2013|access-date=5 June 2021}}
{{cite news|title=CASTAIGNOS: 'WE HADDEN DE MACHT'|url=https://www.onsoranje.nl/nieuws/jong-oranje/54310/castaignos-we-hadden-de-macht|publisher=Ons Oranje|language=nl|date=11 October 2013|access-date=5 June 2021}}
A month later on 14 November 2013, Castaignos scored his fourth goal for U21 national team, in a 2–2 draw against Slovakia U21.{{cite news|title=PUNTVERLIES VOOR JO IN SLOWAKIJE|url=https://www.onsoranje.nl/nieuws/jong-oranje/55270/puntverlies-voor-jo-slowakije|publisher=Ons Oranje|language=nl|date=14 November 2013|access-date=5 June 2021}} On 3 June 2014, he scored his fifth goal for Netherlands U21, in a 3–1 win against Luxembourg U21.{{cite news|title=JONG ORANJE VERSLAAT TAAI LUXEMBURG|url=https://www.onsoranje.nl/nieuws/jong-oranje/58246/jong-oranje-verslaat-taai-luxemburg|publisher=Ons Oranje|language=nl|date=3 June 2014|access-date=5 June 2021}} Castaignos then made three more appearances for the U21 national team by the time he was 22 years old.{{cite news|title=ZWAK JO ONDERUIT TEGEN GEORGIË|url=https://www.onsoranje.nl/nieuws/jong-oranje/59686/zwak-jo-onderuit-tegen-georgië|publisher=Ons Oranje|language=nl|date=4 September 2014|access-date=5 June 2021}}
{{cite news|title=JO TEN ONDER TEGEN CONCURRENT|url=https://www.onsoranje.nl/nieuws/jong-oranje/59746/jo-ten-onder-tegen-concurrent|publisher=Ons Oranje|language=nl|date=8 September 2014|access-date=5 June 2021}}
{{cite news|title=EK VER WEG VOOR JONG ORANJE|url=https://www.onsoranje.nl/nieuws/jong-oranje/60090/ek-ver-weg-voor-jong-oranje|publisher=Ons Oranje|language=nl|date=9 October 2014|access-date=5 June 2021}}
{{cite news|title=CASTAIGNOS NIET INZETBAAR IN RETURN|url=https://www.onsoranje.nl/nieuws/jong-oranje/60118/castaignos-niet-inzetbaar-return|publisher=Ons Oranje|language=nl|date=10 October 2014|access-date=5 June 2021}}
Castaignos made fifteen appearances and scoring six times for the Netherlands U21.

Playing style

Castaignos' playing style led the media to compare him to Thierry Henry.{{cite news|title=MAKAAY: 'CASTAIGNOS KOMT ER WEL'|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/12282/makaay-castaignos-komt-er-wel|publisher=Ons Oranje|language=nl|date=5 September 2010|access-date=5 June 2021}}{{cite news|title=Don mortero (Luc Castaignos)|url=http://www.elenganche.es/2009/07/don-mortero-luc-castaignos.html|publisher=El Enganche|language=es|date=10 July 2009|access-date=29 November 2012|url-status=dead|archive-url=https://web.archive.org/web/20120815071906/http://www.elenganche.es/2009/07/don-mortero-luc-castaignos.html|archive-date=15 August 2012}}
{{cite news|title=Man Utd target Dutch whizkid Luc Castaignos|url=http://www.totalfootballmadness.com/2009/06/15/man-utd-target-dutch-whizkid-luc-castaignos/|newspaper=Total Football Madness|date=15 June 2009|access-date=26 September 2009|url-status=dead|archive-url=https://web.archive.org/web/20090618014012/http://totalfootballmadness.com/2009/06/15/man-utd-target-dutch-whizkid-luc-castaignos/|archive-date=18 June 2009}}
However, he received criticism from the Netherlands media failing to live up to his potential, as well as, his performance.{{cite news|title=Castaignos leert van Diego Costa: "Echt een voorbeeld"|url=https://www.fcupdate.nl/voetbalnieuws/264428/castaignos-leert-van-diego-costa-echt-een-voorbeeld/|publisher=FC Update|language=nl|date=18 September 2014|access-date=5 June 2021}}
{{cite news|title=Castaignos: 'Ik heb een negatief stempel'|url=https://www.rijnmond.nl/nieuws/128678/Castaignos-Ik-heb-een-negatief-stempel|publisher=RTV Rijnmond|language=nl|date=29 April 2015|access-date=5 June 2021}}
{{cite news|title=Steijn: "Castaignos geen slechte spits, maar een topper"|url=https://www.fcupdate.nl/voetbalnieuws/329109/steijn-castaignos-geen-slechte-spits-maar-een-topper/|publisher=FC Update|language=nl|date=23 February 2018|access-date=5 June 2021}}

Former Feyenoord striker Roy Makaay said about the player, saying: "He has an awful lot of qualities, but also shortcomings. The great thing is that he sees that himself. A good quality. Initially, Luc could only stand on his left leg, but recently he has already developed in that area. More is expected of him than is realistic with his age. That applies to more guys at Feyenoord and that creates enormous pressure. Then things are not going well, the results are not really good and that pressure will only increase. He has a lot of qualities, but also shortcomings. The good thing is that he sees it himself. A good feature. Initially Luc could only stand on his left leg, but lately he has already developed in that area."{{cite news|title=Makaay: "Castaignos komt er wel"|url=https://www.fcupdate.nl/voetbalnieuws/155727/makaay-castaignos-komt-er-wel/|publisher=FC Update|language=nl|date=5 September 2010|access-date=5 June 2021}}
{{cite news|title=MAKAAY GELOOFT IN CASTAIGNOS|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/15022/makaay-gelooft-castaignos|publisher=Ons Oranje|language=nl|date=22 October 2010|access-date=5 June 2021}}
{{cite news|title=Makaay tempert hype om Castaignos|url=https://www.rijnmond.nl/nieuws/11516/Makaay-tempert-hype-om-Castaignos|publisher=RTV Rijnmond|language=nl|date=1 November 2010|access-date=5 June 2021}}
Then Feyenoord manager Mario Been said about Castaignos, saying: "He is getting better and better, I am actually only waiting for a goal. I will just let Luc be in the front line for the coming period. If he makes a few, he can do so enormously help out. Luc fends off in the duels with big defenders, uses his body better and better. He clearly has the qualities for it."{{cite web|url=http://www.telegraaf.nl/telesport/voetbal/feyenoord/7830751/__Been__Ik_laat_Castaignos_gewoon_staan__.html|title=Been: Ik laat Castaignos gewoon staan|work=De Telegraaf|language=nl|date=4 October 2010|access-date=5 June 2021|archiveurl=https://web.archive.org/web/20101008185404/http://www.telegraaf.nl/telesport/voetbal/feyenoord/7830751/__Been__Ik_laat_Castaignos_gewoon_staan__.html?sn=voetbal|archive-date=8 October 2010|url-status=dead}}
{{cite news|title=Been met dezelfde elf namen tegen PSV|url=https://www.fcupdate.nl/voetbalnieuws/159742/been-met-dezelfde-elf-namen-tegen-psv/|publisher=FC Update|language=nl|date=22 October 2010|access-date=5 June 2021}}
{{cite news|title=BEEN: 'CASTAIGNOS STEEDS BETER'|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/16086/been-castaignos-steeds-beter|publisher=Ons Oranje|language=nl|date=13 November 2010|access-date=5 June 2021}}
{{cite news|title=BEEN PASSEERT LUC CASTAIGNOS|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/19078/been-passeert-luc-castaignos|publisher=Ons Oranje|language=nl|date=21 January 2011|access-date=5 June 2021}}

Castaignos spoke about his physical appearance in his early Feyenoord's career, saying: "You demand a lot from your body in such a football year. I notice at the top how important it is to have strength.Especially since I am not yet fully grown due to my age and still have to gain a few kilos of muscle strength. That is where my gains are in the coming seasons. I already notice that I have become stronger. At the beginning of the competition I was pushed away more easily then now."{{cite news|title=Castaignos: "Moet nog aan spierkracht winnen"|url=https://www.fcupdate.nl/voetbalnieuws/176351/castaignos-moet-nog-aan-spierkracht-winnen/|publisher=FC Update|language=nl|date=16 May 2011|access-date=5 June 2021}}{{cite news|title=CASTAIGNOS: 'GEWOON SCOREN'|url=https://www.onsoranje.nl/nieuws/jong-oranje/27690/castaignos-gewoon-scoren|publisher=Ons Oranje|language=nl|date=5 September 2011|access-date=5 June 2021}} Manager Been said: "We only had Luc as a deep striker. Now he can handle it physically well. He's getting stronger and holding his own."{{cite news|title=CASTAIGNOS WORDT STEEDS STERKER|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/17814/castaignos-wordt-steeds-sterker|publisher=Ons Oranje|language=nl|date=18 December 2010|access-date=5 June 2021}} Manager Steve McClaren said about the Castaignos, saying: "Luc Castaignos is also doing well. We like what we see of him in training, he is a real striker who wants to score continuously. He is working on his fitness and needs some time."{{cite news|title=McClaren lacht om status van topfavoriet|url=http://www.fcupdate.nl/voetbalnieuws/211999/mcclaren-lacht-om-status-van-topfavoriet/|publisher=FC Update|language=nl|date=17 August 2012|access-date=5 June 2021}}

Regarding his failed spell at Inter Milan, former Feyenoord striker Pierre van Hooijdonk said: "The problem with Luc Castaignos is that people see him as a player who comes from Inter. And that is not right, because that is not his shoe size. You have to judge him as a Feyenoord player and not with an Inter shirt on, because that has never been his level. The problem with Castaignos is that he doesn't score enough at the moment. If that is the case, other things are looked at and a striker is criticized for his playing football. You never hear that about a striker who has twenty in it."{{cite news|title=Van Hooijdonk neemt het op voor Castaignos|url=http://www.fcupdate.nl/voetbalnieuws/218767/van-hooijdonk-neemt-het-op-voor-castaignos/|publisher=FC Update|language=nl|date=3 November 2012|access-date=5 June 2021}} Makkay also said about the striker's time in Italy: "I cannot judge what he did in Italy that year. But he has hardly played. And for a young player it is of course important to play many matches. On the other hand, he was able to train at a high level at Internazionale."{{cite news|title=Makaay: "Castaignos toont weinig verbetering"|url=http://www.fcupdate.nl/voetbalnieuws/218859/makaay-castaignos-toont-weinig-verbetering/|publisher=FC Update|language=nl|date=4 November 2012|access-date=5 June 2021}}

Then Eintracht Frankfurt Manager Armin Veh said: "He can combine, play as a second tip or come over the left wing. We are very variable there", while manager Gertjan Verbeek called him "a second striker".{{cite news|title=Meier kommt, Madlung geht|url=https://www.fr.de/eintracht-frankfurt/meier-kommt-madlung-geht-11182186.html|publisher=Frankfurter Rundschau|language=de|date=7 July 2015|access-date=5 June 2021}}
{{cite news|title=Douglas, Bryan Ruiz e Castaignos são velhos conhecidos de Verbeek|url=https://www.record.pt/futebol/futebol-nacional/liga-nos/sporting/detalhe/velhos-conhecidos-de-gertjan-verbeek|publisher=Record|language=pt|date=18 September 2016|access-date=5 June 2021}}

Personal life

In March 2011, Castaignos and his then teammate Ron Vlaar took part in a spinning marathon for the charity, Stichting Luna Sluiter Foundation.{{cite news|title=Vlaar en Castaignos spinnen voor goede doel|url=https://www.rijnmond.nl/nieuws/7608/Vlaar-en-Castaignos-spinnen-voor-goede-doel|publisher=RTV Rijnmond|language=nl|date=5 March 2011|access-date=4 June 2021}}

Upon joining Inter Milan, he began learning Italian.{{cite news|title=Castaignos spreekt Italië-trip tegen|url=https://feyenoord.supporters.nl/nieuws/artikel/23342/Castaignos-spreekt-Itali%C3%AB-trip-tegen|publisher=Feyenoord Supporters News|language=nl|date=9 February 2011|access-date=5 June 2021}} Growing up, Castaignos said he idolised Samuel Eto'o.{{cite news|title='GROOTSTE IDOOL IS ETO'O'|url=https://www.onsoranje.nl/nieuws/jeugd-mannen-onder-19/25686/grootste-idool-etoo|publisher=Ons Oranje|language=nl|date=12 July 2011|access-date=5 June 2021}} In January 2014, Castaignos got his wisdom tooth removed and missed FC Twente's pre–season winter for three days.{{cite news|title=Castaignos mist eerste training, Promes wel present|url=http://www.fcupdate.nl/voetbalnieuws/248232/castaignos-mist-eerste-training-promes-wel-present/|publisher=FC Update|language=nl|date=3 January 2014|access-date=5 June 2021}}
{{cite news|title=Castaignos hervat looptraining bij FC Twente|url=http://www.fcupdate.nl/voetbalnieuws/248406/castaignos-hervat-looptraining-bij-fc-twente/|publisher=FC Update|language=nl|date=6 January 2014|access-date=5 June 2021}}

Career statistics

{{updated|match played 1 July 2023{{Cite news |title=L. Castaignos |url=https://int.soccerway.com/players/luc-castaignos/102895/ |website=Soccerway |access-date=28 February 2018}}}}

class="wikitable" style="text-align:center"

|+ Appearances and goals by club, season and competition

rowspan="2"|Club

!rowspan="2"|Season

!colspan="3"|League

!colspan="2"|Cup

!colspan="2"|Continental

!colspan="2"|Other

!colspan="2"|Total

DivisionAppsGoalsAppsGoalsAppsGoalsAppsGoalsAppsGoals
rowspan="3"|Feyenoord

|2009–10

|rowspan="2"|Eredivisie

|3

020colspan="2"|—colspan="2"|—50
2010–11

|34

15102{{efn|name=UEL|Appearance(s) in UEFA Europa League}}0colspan="2"|—3715
colspan="2"|Total

!37

153020004215
Inter Milan

|2011–12

|Serie A

|6

110001{{efn|name=SUC|Appearance(s) in Supercoppa Italiana}}081
rowspan="4"|Twente

|2012–13

|rowspan="3"|Eredivisie

|34

13218{{efn|name=UEL}}0colspan="2"|—4414
2013–14

|31

1400colspan="2"|—colspan="2"|—3114
2014–15

|29

10432{{efn|name=UEL}}1colspan="2"|—3514
colspan="2"|Total

!94

37641010011042
rowspan="3"|Eintracht Frankfurt

|2015–16

|rowspan="2"|Bundesliga

|19

411colspan="2"|—1{{efn|name=BPL|Appearance(s) in Bundesliga relegation play-offs}}0215
2016–17

|0

010colspan="2"|—colspan="2"|—10
colspan="2"|Total

!19

4210010225
rowspan="3"|Sporting CP

|2016–17

|rowspan="2"|Primeira Liga

|6

06{{efn|Three appearances in Taça de Portugal, three in Taça da Liga}}01{{efn|name=UCL|Appearance(s) in UEFA Champions League}}0colspan="2"|—130
2018–19

|3

01{{efn|One appearances in Taça de Portugal}}00{{efn|name=UCL}}0colspan="2"|—40
colspan="2"|Total

!9

0701000170
Vitesse (loan)

|2017–18

|Eredivisie

|29

2105{{efn|name=UEL}}12{{efn|name=EPL|Appearance(s) in Eredivisie European play-offs}}0373
rowspan="3"|Gyeongnam FC

|2019

|K League 1

|22

3103{{efn|name=ACL|Appearance(s) in AFC Champions League}}1colspan="2"|—264
2020

|K League 2

|8

200colspan="2"|—colspan="2"|—82
colspan="2"|Total

!30

5103100346
rowspan="3"|OFI

|2020–21

|rowspan="2"|Superleague Greece

|8

110colspan="2"|—colspan="2"|—91
2021–22

|12

032colspan="2"|—colspan="2"|—152
colspan="2"|Total

!20

1420000243
rowspan="3"|1. FC Magdeburg

|2022–23

|rowspan="2"|2. Bundesliga

|7

100colspan="2"|—colspan="2"|—71
2023–24

|0

000colspan="2"|—colspan="2"|—00
colspan="2"|Total

!7

100000071
colspan="3"|Career total

!251

662572134030176

{{notelist}}

Honours

References

{{Reflist}}