Matt Cassel

Cassel was born in Los Angeles. When he was 11 years old, his family home was at the epicenter of the 1994 Northridge earthquake, which at one point trapped his father Greg under a marble column and caused water from their swimming pool to flood their house. Their home was eventually condemned as a result, forcing the Cassel family to move.{{Cite web |last=King |first=Peter |author-link=Peter King (sportswriter) |date=May 30, 2011 |title=Chiefs, Rams players lend hand to tornado recovery effort in Joplin |url=http://sportsillustrated.cnn.com/2011/writers/peter_king/05/30/mmqb/index.html |url-status=dead |archive-url=https://web.archive.org/web/20110602111734/http://sportsillustrated.cnn.com/2011/writers/peter_king/05/30/mmqb/index.html |archive-date=June 2, 2011 |access-date=June 4, 2011 |website=SI.com}}

Cassel was the starting first baseman on the Northridge baseball team that reached the finals of the 1994 Little League World Series.{{Cite web |date=March 21, 2005 |title=Exit Interview: Matt Cassel |url=http://usc.scout.com/2/361850.html |url-status=dead |archive-url=https://web.archive.org/web/20060118131331/http://usc.scout.com/2/361850.html |archive-date=January 18, 2006 |access-date=August 12, 2006 |website=Scout.com}}

Cassel attended Chatsworth High School and was a letterman, an all-city selection, and a standout in football, basketball, and baseball.{{Cite web |last=Sondheimer |first=Eric |date=February 10, 2011 |title=Matt Cassel's story is one of patience, perseverance |url=https://www.latimes.com/sports/la-xpm-2011-feb-10-la-sp-0211-sondheimer-matt-cassel-20110211-story.html |url-status=live |archive-url=https://web.archive.org/web/20150921203749/http://articles.latimes.com/2011/feb/10/sports/la-sp-0211-sondheimer-matt-cassel-20110211 |archive-date=September 21, 2015 |access-date=January 25, 2018 |website=Los Angeles Times |language=en-US |issn=0458-3035}} As a senior, he was ranked as the number eight quarterback and ranked 53rd overall of the top high school players in the nation according to ESPN's Tom Lemming's Top 100. Lemming called Cassel a "pro-style pocket passer with a very strong, accurate delivery."{{Cite web |date=February 21, 2000 |title=Recruiting: Tom Lemming's Top 100 |url=https://www.espn.com/recruiting/s/lemmingtop100.html |url-status=live |archive-url=https://web.archive.org/web/20160918034629/http://www.espn.com/recruiting/s/lemmingtop100.html |archive-date=September 18, 2016 |access-date=November 19, 2008 |website=ESPN.com}} In addition to playing quarterback, Cassel was also Chatsworth's punter.{{Cite web |date=December 29, 2008 |title=QB had to throw caution at the wind |url=http://www.boston.com/sports/football/patriots/articles/2008/12/29/qb_had_to_throw_caution_at_the_wind/ |url-status=live |archive-url=https://web.archive.org/web/20090303073743/http://www.boston.com/sports/football/patriots/articles/2008/12/29/qb_had_to_throw_caution_at_the_wind/ |archive-date=March 3, 2009 |access-date=June 5, 2011 |website=Boston.com}}

Cassel committed to play at USC before starting his senior year in high school.{{Cite web |last=Sondheimer |first=Eric |date=August 25, 1999 |title=Four of a Kind |url=https://www.latimes.com/archives/la-xpm-1999-aug-25-sp-3455-story.html |url-status=live |archive-url=https://web.archive.org/web/20110107213654/http://articles.latimes.com/1999/aug/25/sports/sp-3455 |archive-date=January 7, 2011 |access-date=June 5, 2011 |website=Los Angeles Times}}

Cassel also had an appearance in the HBO Family program Freshman Year, a reality show in which his younger brother was one of the featured students.

Cassel began his college career in 2001 and spent that entire Trojan career as a backup behind Heisman Trophy winners Carson Palmer and Matt Leinart.{{Cite web |title=2001 USC Trojans Stats |url=https://www.sports-reference.com/cfb/schools/southern-california/2001.html |access-date=October 16, 2022 |website=Sports Reference}}{{Cite web |title=2002 USC Trojans Stats |url=https://www.sports-reference.com/cfb/schools/southern-california/2002.html |url-status=live |archive-url=https://web.archive.org/web/20220926070026/https://www.sports-reference.com/cfb/schools/southern-california/2002.html |archive-date=September 26, 2022 |access-date=October 16, 2022 |website=Sports Reference}}{{Cite web |title=2003 USC Trojans Stats |url=https://www.sports-reference.com/cfb/schools/southern-california/2003.html |url-status=live |archive-url=https://web.archive.org/web/20220903160419/https://www.sports-reference.com/cfb/schools/southern-california/2003.html |archive-date=September 3, 2022 |access-date=October 16, 2022 |website=Sports Reference}}{{Cite web |title=2004 USC Trojans Stats |url=https://www.sports-reference.com/cfb/schools/southern-california/2004.html |url-status=live |archive-url=https://web.archive.org/web/20220927100848/https://www.sports-reference.com/cfb/schools/southern-california/2004.html |archive-date=September 27, 2022 |access-date=October 16, 2022 |website=Sports Reference}} He saw limited time in three games in the 2001 season. Cassel made his lone collegiate start at H-back against California in 2001.{{Cite web |title=Matt Cassel 2001 Game Log |url=https://www.sports-reference.com/cfb/players/matt-cassel-1/gamelog/2001/ |url-status=live |archive-url=https://web.archive.org/web/20180126012736/https://www.sports-reference.com/cfb/players/matt-cassel-1/gamelog/2001/ |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Sports Reference |language=en}} He was the backup for Palmer during his Heisman-winning 2002 season. Cassel appeared in three games and completed three passes for 27 total yards.{{Cite web |title=Matt Cassel 2002 Game Log |url=https://www.sports-reference.com/cfb/players/matt-cassel-1/gamelog/2002 |url-status=live |archive-url=https://web.archive.org/web/20180126012836/https://www.sports-reference.com/cfb/players/matt-cassel-1/gamelog/2002 |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Sports Reference |language=en}} In the fall, he lost the battle for the starting position to the previous third-string quarterback in Leinart. As a result of Leinart's success, Cassel spent time at tight end and wide receiver in 2003, and some special teams that year. In the 2003 season, he appeared in two games and completed 6-of-13 passes for 63 yards.{{Cite web |title=Matt Cassel 2003 Game Log |url=https://www.sports-reference.com/cfb/players/matt-cassel-1/gamelog/2003 |url-status=live |archive-url=https://web.archive.org/web/20180126012742/https://www.sports-reference.com/cfb/players/matt-cassel-1/gamelog/2003 |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Sports Reference |language=en}} In his last season with the Trojans, Cassel was 10-of-14 for 97 yards and an interception.{{Cite web |title=Matt Cassel 2004 Game Log |url=https://www.sports-reference.com/cfb/players/matt-cassel-1/gamelog/2004 |url-status=live |archive-url=https://web.archive.org/web/20180126012500/https://www.sports-reference.com/cfb/players/matt-cassel-1/gamelog/2004 |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Sports Reference |language=en}}

During his four seasons at USC, Cassel completed 20-of-33 passes for 192 yards, with no touchdowns and one interception.{{Cite web |title=Matt Cassel College Stats |url=https://www.sports-reference.com/cfb/players/matt-cassel-1.html |url-status=live |archive-url=https://web.archive.org/web/20180309030649/https://www.sports-reference.com/cfb/players/matt-cassel-1.html |archive-date=March 9, 2018 |access-date=October 16, 2022 |website=Sports Reference}} Cassel, a communication major at USC, was also roommates with Pittsburgh Steelers safety Troy Polamalu{{Cite web |last=Brown |first=Scott |date=November 28, 2008 |title=Parker back to practice |url=http://www.pittsburghlive.com/x/pittsburghtrib/sports/steelers/s_600495.html |url-status=dead |archive-url=https://web.archive.org/web/20081201060819/http://www.pittsburghlive.com/x/pittsburghtrib/sports/steelers/s_600495.html |archive-date=December 1, 2008 |access-date=June 5, 2011 |publisher=Pittsburghlive.com}} and Carson Palmer.{{Cite web |last=Bonsignore |first=Vincent |date=December 23, 2012 |title=Former USC QBs Carson Palmer, Matt Leinart and Matt Cassel meet in the crossroads of Oakland |url=https://www.dailynews.com/sports/20121223/vincent-bonsignore-former-usc-qbs-carson-palmer-matt-leinart-and-matt-cassel-meet-in-the-crossroads-of-oakland |url-status=live |archive-url=https://web.archive.org/web/20221016204252/https://www.dailynews.com/2012/12/23/vincent-bonsignore-former-usc-qbs-carson-palmer-matt-leinart-and-matt-cassel-meet-in-the-crossroads-of-oakland/ |archive-date=October 16, 2022 |access-date=October 16, 2022 |website=Daily News |language=en-US}}

Cassel played one season of baseball for USC in 2004, compiling an 0–1 record with 10 strikeouts and four walks. He played in eight games and started one. Cassel struck out in his only at bat in college. He also had two saves with a 9.35 ERA, and was selected by the Oakland Athletics in the 36th round of the 2004 MLB Draft.{{Cite web |title=36th Round of the 2004 MLB June Amateur Draft |url=https://www.baseball-reference.com/draft/ |url-status=live |archive-url=https://web.archive.org/web/20221011075928/https://www.baseball-reference.com/draft/ |archive-date=October 11, 2022 |access-date=October 16, 2022 |website=Baseball-Reference.com |language=en}}

{{NFL predraft

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| note = All values taken at Pro Day{{Cite web |title=Matt Cassel, Southern California, QB, 2005 NFL Draft Scout, NCAA College Football |url=http://draftscout.com/dsprofile.php?PlayerId=53540&DraftYear=2005 |url-status=live |archive-url=https://web.archive.org/web/20221016204252/http://draftscout.com/dsprofile.php?PlayerId=53540&DraftYear=2005 |archive-date=October 16, 2022 |access-date=December 23, 2015}}{{Cite web |title=Prospect Profiles |url=http://www.nfl.com/draft/profiles/2005/cassel_matt |url-status=bot: unknown |archive-url=https://web.archive.org/web/20050425234945/http://www.nfl.com/draft/profiles/2005/cassel_matt |archive-date=April 25, 2005 |access-date=May 31, 2013 |website=NFL.com}}{{Cite web |date=January 11, 2020 |title=Matt Cassel RAS |url=https://ras.football/2020/01/11/matt-cassel-ras/ |url-status=live |archive-url=https://web.archive.org/web/20211027182245/https://ras.football/2020/01/11/matt-cassel-ras/ |archive-date=October 27, 2021 |access-date=October 19, 2021 |website=ras.football}}

}}

Despite having had little chance to demonstrate his skills in actual game situations at USC, Cassel earned himself a place on several NFL teams' draft boards after working out at USC's 2005 Pro Day. One of Cassel's coaches, Norm Chow, who had left USC to become the offensive coordinator for the Tennessee Titans, had discussed signing Cassel as an undrafted free agent after the 2005 NFL draft; Chow was surprised to learn the Patriots had drafted Cassel in the seventh round, with the 230th overall pick,{{Cite web |last=Peter |first=Josh |date=June 1, 2011 |title=Cassel finally gets his shot |url=https://sports.yahoo.com/nfl/news?slug=jo-cassel091208 |url-status=live |archive-url=https://web.archive.org/web/20160303185909/http://sports.yahoo.com/nfl/news?slug=jo-cassel091208 |archive-date=March 3, 2016 |access-date=June 5, 2011 |website=Yahoo! Sports}} ahead of more accomplished college quarterbacks such as Timmy Chang and 2003 Heisman Trophy winner Jason White.{{Cite web |title=2005 NFL Draft Listing |url=https://www.pro-football-reference.com/years/2005/draft.htm |url-status=live |archive-url=https://web.archive.org/web/20150905090453/http://www.pro-football-reference.com/years/2005/draft.htm |archive-date=September 5, 2015 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}

Cassel began the 2005 season third on the Patriots' depth chart behind Tom Brady and Doug Flutie, after beating out two more veteran quarterbacks, Chris Redman and Rohan Davey. He saw his first regular season action in the closing minutes of the Patriots' 41–17 loss to the San Diego Chargers on October 2, 2005, going 2-for-4 for 15 yards and an interception.{{Cite web |title=San Diego Chargers at New England Patriots – October 2nd, 2005 |url=https://www.pro-football-reference.com/boxscores/200510020nwe.htm |url-status=live |archive-url=https://web.archive.org/web/20180126071001/https://www.pro-football-reference.com/boxscores/200510020nwe.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}

In the Patriots' final game of the regular season, a 28–26 loss to the Miami Dolphins on January 1, 2006, Cassel played the final three quarters. Though he was sacked for a safety, Cassel threw two touchdowns, one to wide receiver Tim Dwight, and the second to tight end Benjamin Watson. The pass to Dwight set up a drop-kick by Doug Flutie, the first such kick since 1941.{{Cite web |title=Miami Dolphins at New England Patriots – January 1st, 2006 |url=https://www.pro-football-reference.com/boxscores/200601010nwe.htm |url-status=live |archive-url=https://web.archive.org/web/20190325221747/https://www.pro-football-reference.com/boxscores/200601010nwe.htm |archive-date=March 25, 2019 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}

Following Flutie's retirement in the 2006 offseason, Cassel moved up to second on the Patriots' depth chart. Although the Patriots considered signing a veteran quarterback to compete with him, Cassel played well in preseason and became the primary backup to Brady.{{Cite web |last1=Solomon |first1=Jerome |last2=Reiss |first2=Mike |date=June 15, 2006 |title=QB Cassel is looking out for No. 2 |url=http://archive.boston.com/sports/football/patriots/articles/2006/06/15/qb_cassel_is_looking_out_for_no_2/ |url-status=live |archive-url=https://web.archive.org/web/20190124204058/http://archive.boston.com/sports/football/patriots/articles/2006/06/15/qb_cassel_is_looking_out_for_no_2/ |archive-date=January 24, 2019 |access-date=January 24, 2019 |website=archive.boston.com |language=en}} Cassel was on the 45-man active roster for all 16 games in 2006; when the Patriots brought in yet another Heisman winner, Vinny Testaverde, who acted as the emergency quarterback.{{Cite web |date=November 14, 2006 |title=Pats sign Testaverde |url=https://www.espn.com/nfl/news/story?id=2662075 |url-status=live |archive-url=https://web.archive.org/web/20190124203356/http://www.espn.com/nfl/news/story?id=2662075 |archive-date=January 24, 2019 |access-date=January 24, 2019 |website=ESPN.com |language=en |agency=Associated Press}}

After injuries to Josh Miller and Ken Walter in Week 16, Cassel assumed duties as holder for kicker Stephen Gostkowski. He also led a late touchdown drive in the regular-season finale against the Tennessee Titans.{{Cite web |title=New England Patriots at Tennessee Titans – December 31st, 2006 |url=https://www.pro-football-reference.com/boxscores/200612310oti.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070705/https://www.pro-football-reference.com/boxscores/200612310oti.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}

Cassel remained in a backup role in the 2007 season.{{Cite web |title=Matt Cassel 2007 Game Log |url=https://www.pro-football-reference.com/players/C/CassMa00.htm |url-status=live |archive-url=https://web.archive.org/web/20190124203904/https://www.pro-football-reference.com/players/C/CassMa00.htm |archive-date=January 24, 2019 |access-date=January 24, 2019 |website=Pro Football Reference |language=en}} During Week 7 against the Miami Dolphins, Cassel's second pass was intercepted by Jason Taylor and returned for a touchdown.{{Cite web |title=New England Patriots at Miami Dolphins – October 21st, 2007 |url=https://www.pro-football-reference.com/boxscores/200710210mia.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070643/https://www.pro-football-reference.com/boxscores/200710210mia.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} In the next game against the Washington Redskins, Cassel capped off the 52–7 victory with a 15-yard touchdown run in which he dove over two Washington defenders to reach the end zone.{{Cite web |title=Washington Redskins at New England Patriots – October 28th, 2007 |url=https://www.pro-football-reference.com/boxscores/200710280nwe.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070733/https://www.pro-football-reference.com/boxscores/200710280nwe.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}

File:Matt Cassel.JPG

File:Patriots 41 - Broncos 7.jpg

During the season-opener against the Kansas City Chiefs, Cassel came under center when Brady suffered a torn ACL and MCL in the first quarter from a hit by Chiefs safety Bernard Pollard. Cassel led the Patriots to a 17–10 victory, completing 13-of-18 passes for 152 yards and a touchdown; his drives accounted for all of New England's points.{{Cite web |title=Kansas City Chiefs at New England Patriots – September 7th, 2008 |url=https://www.pro-football-reference.com/boxscores/200809070nwe.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070755/https://www.pro-football-reference.com/boxscores/200809070nwe.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} The day after the game, the Patriots confirmed that Brady's injuries would sideline him for the rest of the season. Although the Patriots did bring quarterbacks Chris Simms and Tim Rattay to Foxborough,{{Cite web |last=Battista |first=Judy |author-link=Judy Battista |date=September 9, 2008 |title=Belichick Declines to Sign Simms and Rattay |url=https://www.nytimes.com/2008/09/10/sports/football/10patriots.html?ref=sports |url-status=live |archive-url=https://web.archive.org/web/20160112153141/http://www.nytimes.com/2008/09/10/sports/football/10patriots.html?ref=sports |archive-date=January 12, 2016 |access-date=June 5, 2011 |website=The New York Times}} they signed neither, and kept Cassel as the starter.

Cassel made his first NFL start on September 14, 2008, with a winning effort over the New York Jets, completing 16 of 23 passes for 165 yards.{{Cite web |title=New England Patriots at New York Jets – September 14th, 2008 |url=https://www.pro-football-reference.com/boxscores/200809140nyj.htm |url-status=live |archive-url=https://web.archive.org/web/20180104132401/https://www.pro-football-reference.com/boxscores/200809140nyj.htm |archive-date=January 4, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} The Patriots' 19–10 victory was the first time in six tries that a quarterback making his first NFL start defeated a team led by Brett Favre.{{Cite web |last=Martone |first=Art |date=September 11, 2008 |title=Transcript: Matt Cassel's Thursday press conference (September 11, 2008) |url=http://www.beloblog.com/ProJo_Blogs/PatsBlog/2008/09/transcript-matt.html |url-status=dead |archive-url=https://web.archive.org/web/20110929011600/http://www.beloblog.com/ProJo_Blogs/PatsBlog/2008/09/transcript-matt.html |archive-date=September 29, 2011 |access-date=June 5, 2011 |website=Beloblog.com}}

Cassel was voted AFC Offensive Player of the Week for his Week 7 performance against the Denver Broncos on Monday Night Football. Cassel had 183 passing yards and three touchdowns in a 41–7 rout, which made it his first three touchdown pass game.{{Cite web |title=Denver Broncos at New England Patriots – October 20th, 2008 |url=https://www.pro-football-reference.com/boxscores/200810200nwe.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070645/https://www.pro-football-reference.com/boxscores/200810200nwe.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}{{Cite news |date=October 22, 2008 |title=Cassel named AFC Offensive Player of the Week |url=http://www.boston.com/sports/football/patriots/reiss_pieces/2008/10/cassel_named_af.html |url-status=live |archive-url=https://web.archive.org/web/20081025042521/http://www.boston.com/sports/football/patriots/reiss_pieces/2008/10/cassel_named_af.html |archive-date=October 25, 2008 |access-date=October 22, 2008 |work=Reiss' Pieces, The Boston Globe}}

File:Matt Cassell.jpg

Cassel scored the second rushing touchdown of his career on a 13-yard rush in Week 10 against the Buffalo Bills as the Patriots won 20–10. The Patriots held the ball in the game for over 37 minutes; the final 19-play drive, which lasted over nine minutes, tied a franchise record for most plays in a single drive.{{Cite web |title=Buffalo Bills at New England Patriots – November 9th, 2008 |url=https://www.pro-football-reference.com/boxscores/200811090nwe.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070749/https://www.pro-football-reference.com/boxscores/200811090nwe.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}

During a Week 11 34–31 overtime loss to the New York Jets, Cassel led the Patriots on three consecutive scoring drives to bring them back from a 24–6 deficit with two minutes left in the first half, and threw a 16-yard touchdown to Randy Moss on 4th-and-1 with one second remaining to send the game into overtime. He finished 30-for-51 passing, with 400 yards, 3 touchdowns (and a pass for a two-point conversion), and no interceptions for a passer rating of 103.4, and 62 yards rushing on eight attempts.{{Cite web |title=New York Jets at New England Patriots – November 13th, 2008 |url=https://www.pro-football-reference.com/boxscores/200811130nwe.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070731/https://www.pro-football-reference.com/boxscores/200811130nwe.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} Cassel became the first Patriot to throw for 300 yards and rush for 50 yards in the same game, and the first player since at least the AFL-NFL merger to have 400 passing yards and 60 rushing yards in the same game.{{Cite web |title=New York Jets at New England Patriots November 16, 2008 |url=https://www.nfl.com/games/jets-at-patriots-2008-reg-11 |url-status=live |archive-url=https://web.archive.org/web/20220131041620/https://www.nfl.com/games/jets-at-patriots-2008-reg-11 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=NFL.com}}

In Week 12, Cassel led the Patriots to a 48–28 win over the Miami Dolphins, who in Week 3 had ended the Patriots' NFL record 21-game regular-season win streak. While Cassel threw for just 131 yards in the Week 3 loss, his Week 12 performance topped his performance against the Jets: Cassel completed 30 of 43 passes for 415 yards, three touchdowns to Randy Moss, and one interception, for a passer rating of 114.0; Cassel also had 14 yards on two rushes, including an 8-yard touchdown run.{{Cite web |title=New England Patriots at Miami Dolphins – November 23rd, 2008 |url=https://www.pro-football-reference.com/boxscores/200811230mia.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070729/https://www.pro-football-reference.com/boxscores/200811230mia.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} The performance made Cassel the first quarterback in franchise history, and only the fifth quarterback in NFL history, to have consecutive games with 400+ yards passing. His efforts earned him the title of AFC Offensive Player of the Week for the second time.{{Cite news |date=November 26, 2008 |title=Cassel is AFC Offensive Player of the Week |url=http://archive.boston.com/sports/football/patriots/reiss_pieces/2008/11/cassel_is_afc_o.html |access-date=January 30, 2022 |work=Reiss' Pieces, The Boston Globe}}{{Dead link|date=December 2023 |bot=InternetArchiveBot |fix-attempted=yes }}{{Cite web |date=November 25, 2008 |title=Matt Cassel named AFC Offensive Player of the Week |url=https://www.patriots.com/news/matt-cassel-named-afc-offensive-player-of-the-week-154936 |access-date=December 31, 2023 |website=patriots.com}} During Week 15 against the Oakland Raiders, Cassel, playing just six days after the death of his father, set a new personal best, throwing for four touchdowns in a 49–26 victory.{{Cite web |title=New England Patriots at Oakland Raiders – 2008 Week 15 |url=https://www.nfl.com/games/patriots-at-raiders-2008-reg-15 |url-status=live |archive-url=https://web.archive.org/web/20220131041618/https://www.nfl.com/games/patriots-at-raiders-2008-reg-15 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=Nfl.com}}

In Week 16, against the playoff-bound Arizona Cardinals, Cassel led the Patriots to a 47–7 blowout win through snow, sleet, and rain in the Patriots' last regular-season home game of 2008. Cassel, playing in snow for the first time ever,{{Cite web |last=Toland |first=Jennifer |date=December 22, 2008 |title=Snow problem |url=https://www.telegram.com/story/news/local/north/2008/12/22/snow-problem/52156135007/ |url-status=live |archive-url=https://web.archive.org/web/20220131041619/https://www.telegram.com/story/news/local/north/2008/12/22/snow-problem/52156135007/ |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=Worcester Telegram & Gazette}} nevertheless completed 20 of 36 passes for 345 yards, three touchdowns, and no interceptions, while helping the Patriots remain in the hunt for the AFC East title. In a role reversal, Matt Leinart entered the game as the Cardinals' backup quarterback when Kurt Warner was pulled from the game with the Cardinals trailing 44–0; Leinart completed 6 of 14 passes, for 138 yards, a touchdown, and an interception.{{Cite web |title=Arizona Cardinals at New England Patriots – December 21st, 2008 |url=https://www.pro-football-reference.com/boxscores/200812210nwe.htm |url-status=live |archive-url=https://web.archive.org/web/20170901105935/https://www.pro-football-reference.com/boxscores/200812210nwe.htm |archive-date=September 1, 2017 |access-date=October 16, 2022 |website=Pro Football Reference |language=en}}

In Week 17, Cassel led the Patriots to their fourth consecutive win, 13–0 over the Buffalo Bills in a game marked by winds so severe that they bent the goalposts both before and during the game. Cassel completed 6 passes out of just 8 attempts, the third-lowest attempt total in franchise history (the second-lowest being the 5 attempts of the 1982 Snowplow Game and the lowest being the 3 attempts of their 2021 Week 13 game {{Cite web |last=Crabtree |first=Curtis |date=December 7, 2021 |title=Monday Night Football: Patriots throw just three passes, beat Bills 14–10 in blustery Buffalo |url=https://profootballtalk.nbcsports.com/2021/12/06/monday-night-football-patriots-throw-just-three-passes-beat-bills-14-10-in-blustery-buffalo/ |url-status=live |archive-url=https://web.archive.org/web/20220909195638/https://profootballtalk.nbcsports.com/2021/12/06/monday-night-football-patriots-throw-just-three-passes-beat-bills-14-10-in-blustery-buffalo/ |archive-date=September 9, 2022 |access-date=October 16, 2022 |website=ProFootballTalk |language=en-US}} against the Buffalo Bills). Cassel finished the game with 78 yards; his most notable play, however, was a quick kick punt on third down in the fourth quarter; with the wind at his back, Cassel's kick landed inside the 20, and then rolled towards the Bills' end zone before it was downed, stranding the Bills at their own 2-yard line, struggling against the wind, down two scores with five minutes remaining.{{Cite web |title=New England Patriots at Buffalo Bills – December 28th, 2008 |url=https://www.pro-football-reference.com/boxscores/200812280buf.htm |url-status=live |archive-url=https://web.archive.org/web/20220123142728/https://www.pro-football-reference.com/boxscores/200812280buf.htm |archive-date=January 23, 2022 |access-date=October 16, 2022 |website=Pro Football Reference |language=en}}

On January 4, 2009, ESPN's Chris Mortensen reported that the Patriots would franchise tag Cassel.{{Cite web |date=January 5, 2009 |title=Sources: New England Patriots to put franchise tag on Matt Cassel |url=https://www.espn.com/nfl/news/story?id=3809444 |url-status=live |archive-url=https://web.archive.org/web/20180627164722/http://www.espn.com/nfl/news/story?id=3809444 |archive-date=June 27, 2018 |access-date=June 5, 2011 |website=ESPN.com |agency=Associated Press}} The Patriots made it official on February 5, 2009, the first day of the 2009 franchise period,{{Cite web |date=February 5, 2009 |title=Patriots franchise QB Matt Cassel |url=https://www.patriots.com/news/patriots-franchise-qb-matt-cassel-115371 |url-status=live |archive-url=https://web.archive.org/web/20211129020845/https://www.patriots.com/news/patriots-franchise-qb-matt-cassel-115371 |archive-date=November 29, 2021 |access-date=October 16, 2022 |website=www.patriots.com |language=en-US}} and Cassel agreed to the tender two days later.{{Cite web |last=Mortensen |first=Chris |date=February 9, 2009 |title=Cassel to make $14.65M next season |url=https://www.espn.com/nfl/news/story?id=3891669 |url-status=live |archive-url=https://web.archive.org/web/20171031082844/http://www.espn.com/nfl/news/story?id=3891669 |archive-date=October 31, 2017 |access-date=June 5, 2011 |website=ESPN.com}}

By the end of the 2008 season, Cassel had become the first quarterback in NFL history to record at least 10 wins, 325 completions, a 63% completion mark, 3,600 passing yards, 20 touchdown passes, 11 or fewer interceptions, and 250 rushing yards in a single season. As of 2017, only two other quarterbacks have accomplished the feat, Russell Wilson (twice) and Aaron Rodgers (five times).

File:Matt Cassel Chiefs.JPG

On February 28, 2009, the Patriots traded both Cassel and outside linebacker Mike Vrabel to the Kansas City Chiefs for the 34th overall selection (Patrick Chung) in the 2009 NFL draft.{{Cite magazine |last=King |first=Peter |date=February 28, 2009 |title=Chiefs complete trade for Cassel |url=https://www.si.com/more-sports/2009/02/28/chiefs-tradeforcassel |archive-url=https://web.archive.org/web/20090304141840/http://sportsillustrated.cnn.com/2009/writers/peter_king/02/28/chiefs.trade.for.cassel/index.html |archive-date=March 4, 2009 |access-date=January 30, 2022 |magazine=Sports Illustrated}}{{Cite web |date=February 28, 2009 |title=Patriots trade Mike Vrabel & Matt Cassel to Chiefs |url=https://www.patriots.com/news/patriots-trade-mike-vrabel-matt-cassel-to-chiefs-115341 |url-status=live |archive-url=https://web.archive.org/web/20220131041618/https://www.patriots.com/news/patriots-trade-mike-vrabel-matt-cassel-to-chiefs-115341 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=New England Patriots}} NFL Network's Adam Schefter (now with ESPN) described as "one of the wilder and more complex behind-the-scene dramas the NFL has seen in any recent offseason," with the Tampa Bay Buccaneers proposing a three-way trade with the Denver Broncos, in which the Buccaneers would have received Broncos quarterback Jay Cutler, the Broncos would have received Cassel, and New England would have received a first-round draft pick.{{Cite web |last=Schefter |first=Adam |date=February 28, 2009 |title=Cutler upset over potential deals to Detroit, Tampa Bay |url=http://blogs.nfl.com/2009/02/28/cutler-upset-over-potential-deals-to-detroit-tampa-bay/ |url-status=live |archive-url=https://web.archive.org/web/20111005024530/http://blogs.nfl.com/2009/02/28/cutler-upset-over-potential-deals-to-detroit-tampa-bay/ |archive-date=October 5, 2011 |access-date=February 28, 2009 |website=NFL.com}}

Cassel then briefly became teammates with Bernard Pollard, the player whose hit in 2008 caused Brady's injury and subsequently made Cassel the starter that season. In an interview, Cassel said he would "thank" Pollard for the opportunity, but also stated that he believed the hit on Brady was "unintentional" and he never wishes to see anyone get hurt while playing.{{Cite web |date=March 2, 2009 |title=Q&A with QB Matt Cassel |url=http://www.kcchiefs.com/news/2009/03/02/qa_with_qb_matt_cassel__32/ |url-status=dead |archive-url=https://web.archive.org/web/20090304014815/http://www.kcchiefs.com/news/2009/03/02/qa_with_qb_matt_cassel__32/ |archive-date=March 4, 2009 |access-date=March 2, 2009 |website=Kansas City Chiefs}}

Cassel was expected to compete with Tyler Thigpen, who started 11 games for the Chiefs in 2008, for the starting quarterback position.{{Cite web |date=March 2, 2009 |title=Q&A with head coach Todd Haley |url=http://kcchiefs.com/news/2009/03/02/qa_with_todd_haley_3_2_09/ |url-status=dead |archive-url=https://web.archive.org/web/20090306121610/http://www.kcchiefs.com/news/2009/03/02/qa_with_todd_haley_3_2_09 |archive-date=March 6, 2009 |access-date=March 2, 2009 |website=Kansas City Chiefs}} Since Cassel's number 16 from New England is retired in Kansas City in honor of Len Dawson, Cassel decided to wear number 7; he chose 7 because it equals one plus six.{{Cite web |last=Banks |first=Don |date=August 1, 2009 |title=Snap Judgments: Chiefs' Cassel at ease with role as face of franchise |url=http://sportsillustrated.cnn.com/2009/writers/don_banks/08/01/snap.judgments/index.html |url-status=dead |archive-url=https://web.archive.org/web/20090804122646/http://sportsillustrated.cnn.com/2009/writers/don_banks/08/01/snap.judgments/index.html |archive-date=August 4, 2009 |access-date=August 3, 2009 |website=SI.com}} Eventually, Thigpen was traded to the Miami Dolphins.{{Cite web |date=September 29, 2009 |title=Dolphins acquire Thigpen, put Pennington on IR |url=https://www.espn.com/nfl/news/story?id=4516236 |url-status=live |archive-url=https://web.archive.org/web/20190125020302/http://www.espn.com/nfl/news/story?id=4516236 |archive-date=January 25, 2019 |access-date=January 24, 2019 |website=ESPN.com |language=en |agency=Associated Press}}

On July 14, 2009, the Chiefs signed Cassel to a six-year, $62.7 million contract that included $28 million in guaranteed money, and $40.5 million in total compensation in the first three seasons.{{Cite web |last=Clayton |first=John |date=July 14, 2009 |title=Chiefs lock up Cassel |url=https://www.espn.com/nfl/news/story?id=4327067 |url-status=live |archive-url=https://web.archive.org/web/20181016013214/http://www.espn.com/nfl/news/story?id=4327067 |archive-date=October 16, 2018 |access-date=July 15, 2009 |website=ESPN.com}}

On August 29, 2009, Cassel suffered an MCL injury during the first quarter of a preseason game against the Seattle Seahawks. He was dragged to the ground and grabbed for his knee immediately upon impact. Cassel attempted to continue playing but called a timeout and limped off the field.{{Cite news |date=September 16, 2009 |title=Haley: Cassel (knee) a question mark |url=https://www.espn.com/nfl/news/story?id=4476194 |url-status=live |archive-url=https://web.archive.org/web/20170728114311/http://www.espn.com/nfl/news/story?id=4476194 |archive-date=July 28, 2017 |access-date=September 17, 2009 |work=ESPN.com |agency=Associated Press}} Brodie Croyle started the final game of the preseason against the St. Louis Rams as well as the regular season opening game against the Baltimore Ravens when Cassel was still unable to play.{{Cite news |date=September 13, 2009 |title=Kansas City 24, Baltimore 38 |url=http://www.espn.com/nfl/recap?gameId=290913033 |url-status=dead |archive-url=https://web.archive.org/web/20170728075603/http://www.espn.com/nfl/recap?gameId=290913033 |archive-date=July 28, 2017 |access-date=September 17, 2009 |work=ESPN.com |agency=Associated Press}}{{Cite news |date=September 16, 2009 |title=Cassel picks up pace in practice |url=https://www.espn.com/nfl/news/story?id=4478102 |url-status=live |archive-url=https://web.archive.org/web/20170728114309/http://www.espn.com/nfl/news/story?id=4478102 |archive-date=July 28, 2017 |access-date=September 17, 2009 |work=ESPN.com |agency=Associated Press}} Cassel, though, started every game thereafter, going 4–11. He threw for 2,924 yards with 16 touchdowns and 16 interceptions and had a quarterback rating of 69.9 in his first season with the Chiefs.{{Cite web |title=Matt Cassel 2009 Game Log |url=https://www.pro-football-reference.com/players/C/CassMa00/gamelog/2009 |url-status=live |archive-url=https://web.archive.org/web/20180126070700/https://www.pro-football-reference.com/players/C/CassMa00/gamelog/2009 |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}{{Cite web |title=2009 Kansas City Chiefs Statistics & Players |url=https://www.pro-football-reference.com/teams/kan/2009.htm |url-status=live |archive-url=https://web.archive.org/web/20121105172713/http://www.pro-football-reference.com/teams/kan/2009.htm |archive-date=November 5, 2012 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}

File:Matt Cassel Chiefs 2010 (cropped).jpg

In 2010, Cassel had a resurgent season starting with a 21–14 victory over the San Diego Chargers in Week 1 at home in Arrowhead.{{Cite web |title=San Diego Chargers at Kansas City Chiefs – September 13th, 2010 |url=https://www.pro-football-reference.com/boxscores/201009130kan.htm |url-status=live |archive-url=https://web.archive.org/web/20201005175836/https://www.pro-football-reference.com/boxscores/201009130kan.htm |archive-date=October 5, 2020 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} Cassel would build off of this start helping guide the Chiefs to a 7–4 record over the first 12 weeks of the year. Due to his form during November, Cassel was named AFC Offensive Player of the Month for November. He completed 90 of 144 passes (62.5%) for 1,111 yards and an NFL-leading 12 touchdowns, with just one interception. Cassel had a 111.2 passer rating for the month.{{Cite web |last=Looney |first=Matt |date=December 1, 2010 |title=Arrowhead Report: Thursday, December 2nd |url=http://www.chiefs.com/news/article-2/Arrowhead-Report-Thursday-December-2nd/1fc8441c-6614-431d-9aa5-57f7b10fc60c |archive-url=https://web.archive.org/web/20180126185234/http://www.chiefs.com/news/article-2/Arrowhead-Report-Thursday-December-2nd/1fc8441c-6614-431d-9aa5-57f7b10fc60c |archive-date=January 26, 2018 |access-date=December 2, 2010 |website=ESPN.com}} As a result of his performance against the Seattle Seahawks, Cassel won the FedEx Air & Ground NFL Players of the Week award, as voted by the fans.{{Cite web |date=November 29, 2010 |title=Cassel, Hillis voted FedEx Air & Ground Players of the Week |url=https://www.nfl.com/news/cassel-hillis-voted-fedex-air-ground-players-of-the-week-09000d5d81c84c4a |access-date=January 30, 2022 |website=NFL.com}}

On December 8, 2010, Cassel underwent an emergency appendectomy. It was unclear at the time whether he would be able to play in that week's game against the Chargers.{{Cite news |last=Leahy |first=Sean |date=December 8, 2010 |title=Chiefs QB Matt Cassel undergoes appendectomy |url=http://content.usatoday.com/communities/thehuddle/post/2010/12/chiefs-qb-matt-cassel-undergoes-appendectomy/1 |url-status=live |archive-url=https://web.archive.org/web/20101211061412/http://content.usatoday.com/communities/thehuddle/post/2010/12/chiefs-qb-matt-cassel-undergoes-appendectomy/1 |archive-date=December 11, 2010 |access-date=December 8, 2010 |publisher=USA Today}} The Chiefs ended up starting backup Brodie Croyle and lost the game 31–0. Cassel returned for the next two games however and led the Chiefs to landslide wins over both the St. Louis Rams in the Governors Cup and then at home against the Tennessee Titans. The 34–14 win over the Titans, along with a loss by the Chargers to the Bengals, helped the Chiefs clinch the AFC West title.{{Cite web |last=Teicher |first=Adam |date=December 27, 2010 |title=Chiefs on their way to playoffs with win over Titans |url=http://www.kansascity.com/2010/12/26/2543767/chiefs-on-their-way-to-playoffs.html |url-status=live |archive-url=https://web.archive.org/web/20101230085007/http://www.kansascity.com/2010/12/26/2543767/chiefs-on-their-way-to-playoffs.html |archive-date=December 30, 2010 |access-date=December 27, 2010 |publisher=Kansas City Star}} This would be the first Chiefs playoff game in four years and the first home playoff game since 2003, the last time the Chiefs won the AFC West division. In a home playoff 30–7 loss against the Baltimore Ravens, Cassel went 9 of 18 for 70 passing yards and three interceptions.{{Cite web |title=Wild Card – Baltimore Ravens at Kansas City Chiefs – January 9th, 2011 |url=https://www.pro-football-reference.com/boxscores/201101090kan.htm |url-status=live |archive-url=https://web.archive.org/web/20121129064620/http://www.pro-football-reference.com/boxscores/201101090kan.htm |archive-date=November 29, 2012 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}

File:Matt Cassel (Pro Bowl) (cropped).jpg]]

In January 2011, Cassel was named as an alternate to the Pro Bowl in place of an injured Tom Brady.{{Cite web |date=January 20, 2011 |title=Chiefs' Cassel taking Brady's place at Pro Bowl |url=https://www.espn.com/nfl/news/story?id=6041475 |url-status=live |archive-url=https://web.archive.org/web/20190124203900/http://www.espn.com/nfl/news/story?id=6041475 |archive-date=January 24, 2019 |access-date=January 24, 2019 |website=ESPN.com |language=en |agency=Associated Press}}

File:Matt Cassel (cropped).jpg

In 2011, Cassel led the Chiefs to a 4–4 record. During the first two games, he only threw one touchdown. Those first two games were blowout losses.{{Cite web |title=Buffalo Bills at Kansas City Chiefs – September 11th, 2011 |url=https://www.pro-football-reference.com/boxscores/201109110kan.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070805/https://www.pro-football-reference.com/boxscores/201109110kan.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} In the second game, Cassel threw three interceptions.{{Cite web |title=Kansas City Chiefs at Detroit Lions – September 18th, 2011 |url=https://www.pro-football-reference.com/boxscores/201109180det.htm |url-status=live |archive-url=https://web.archive.org/web/20180108062735/https://www.pro-football-reference.com/boxscores/201109180det.htm |archive-date=January 8, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} Cassel finally had his first good game, throwing two touchdowns in a 17–20 loss against the San Diego Chargers.{{Cite web |title=Kansas City Chiefs at San Diego Chargers – September 25th, 2011 |url=https://www.pro-football-reference.com/boxscores/201109250sdg.htm |url-status=live |archive-url=https://web.archive.org/web/20190412154810/https://www.pro-football-reference.com/boxscores/201109250sdg.htm |archive-date=April 12, 2019 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} He led the Chiefs to their first win against the Minnesota Vikings, where he threw for 260 yards and one touchdown.{{Cite web |title=Minnesota Vikings at Kansas City Chiefs – October 2nd, 2011 |url=https://www.pro-football-reference.com/boxscores/201110020kan.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070723/https://www.pro-football-reference.com/boxscores/201110020kan.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} In the next game against the Indianapolis Colts, he led the Chiefs to a comeback victory. The Colts jumped to a 17–0 lead, but Cassel threw four touchdowns and 257 yards with no interceptions to lead the Chiefs to a 28–24 win.{{Cite web |title=Kansas City Chiefs at Indianapolis Colts – October 9th, 2011 |url=https://www.pro-football-reference.com/boxscores/201110090clt.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070744/https://www.pro-football-reference.com/boxscores/201110090clt.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} After the game, Cassel had a 138.9 quarterback rating. In Week 8, Cassel threw one touchdown but also threw two interceptions.{{Cite web |title=San Diego Chargers at Kansas City Chiefs – October 31st, 2011 |url=https://www.pro-football-reference.com/boxscores/201110310kan.htm |url-status=live |archive-url=https://web.archive.org/web/20180126125518/https://www.pro-football-reference.com/boxscores/201110310kan.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} Two weeks later, Cassel injured his hand against the Denver Broncos. He was replaced by Tyler Palko, and had surgery on the injured hand on November 14.{{Cite web |title=Denver Broncos at Kansas City Chiefs – November 13th, 2011 |url=https://www.pro-football-reference.com/boxscores/201111130kan.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070908/https://www.pro-football-reference.com/boxscores/201111130kan.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} On November 21, Cassel was placed on injured reserve, ending his season.{{Cite news |date=November 21, 2011 |title=Chiefs QB Matt Cassel placed on injured reserve with hand injury, ending his season. |url=https://www.washingtonpost.com/sports/redskins/chiefs-qb-matt-cassel-placed-on-injured-reserve-with-hand-injury-ending-his-season/2011/11/21/gIQA1oBDjN_story.html |url-status=dead |archive-url=https://web.archive.org/web/20190103055847/https://www.washingtonpost.com/sports/redskins/chiefs-qb-matt-cassel-placed-on-injured-reserve-with-hand-injury-ending-his-season/2011/11/21/gIQA1oBDjN_story.html |archive-date=January 3, 2019 |access-date=November 22, 2011 |newspaper=Washington Post |agency=Associated Press}}

In Week 1, Cassel had a tremendous first half against the Atlanta Falcons but threw two interceptions in the second half. His final stats were two interceptions, one touchdown, one rushing touchdown, and a 72.5 quarterback rating. The final score resulted in a Chiefs loss, 24–40.{{Cite web |title=Atlanta Falcons at Kansas City Chiefs – September 9th, 2012 |url=https://www.pro-football-reference.com/boxscores/201209090kan.htm |url-status=live |archive-url=https://web.archive.org/web/20170814021354/https://www.pro-football-reference.com/boxscores/201209090kan.htm |archive-date=August 14, 2017 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} The Chiefs had to rely on a 91-yard run by Jamaal Charles, a safety, and four field goals to gain their first win against the New Orleans Saints, as even with excellent field position throughout the second half, Cassel could not lead the team to the endzone; he threw one interception and no touchdowns. The final score of that game was a 27–24 overtime win for the Chiefs.{{Cite web |title=Kansas City Chiefs at New Orleans Saints – September 23rd, 2012 |url=https://www.pro-football-reference.com/boxscores/201209230nor.htm |url-status=live |archive-url=https://web.archive.org/web/20180125031341/https://www.pro-football-reference.com/boxscores/201209230nor.htm |archive-date=January 25, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} The next week, Cassel struggled and threw two touchdowns, but three interceptions in a 20–37 Chiefs loss against the San Diego Chargers.{{Cite web |title=San Diego Chargers at Kansas City Chiefs – September 30th, 2012 |url=https://www.pro-football-reference.com/boxscores/201209300kan.htm |url-status=live |archive-url=https://web.archive.org/web/20180126071007/https://www.pro-football-reference.com/boxscores/201209300kan.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} After the game, his starting job appeared to be in jeopardy, but head coach Romeo Crennel said Cassel would start the next game against the Baltimore Ravens. In that game, Cassel left the game with a head injury.{{Cite web |title=Baltimore Ravens at Kansas City Chiefs – October 7th, 2012 |url=https://www.pro-football-reference.com/boxscores/201210070kan.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070949/https://www.pro-football-reference.com/boxscores/201210070kan.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} Earlier in the day, a group called Save Our Chiefs rallied fans together and flew a banner over Arrowhead calling for the General Manager Scott Pioli to be fired and for Cassel to be benched.{{Cite web |last=Thorman |first=Joel |date=October 7, 2012 |title=The Chiefs banner is in the air |url=https://www.arrowheadpride.com/2012/10/7/3468498/chiefs-fans-fly-banner-arrowhead-pioli-cassel |url-status=live |archive-url=https://web.archive.org/web/20201112021030/https://www.arrowheadpride.com/2012/10/7/3468498/chiefs-fans-fly-banner-arrowhead-pioli-cassel |archive-date=November 12, 2020 |access-date=October 16, 2022 |website=Arrowhead Pride |language=en}}

On October 11, 2012, Crennel announced Cassel had been ruled out of the Week 6 game against the Tampa Bay Buccaneers and named Brady Quinn the starter for the game. At the time of Cassel's injury, he had accumulated nine interceptions and five fumbles through the first five games of the season. This mark was more than any other team in the NFL, except the Philadelphia Eagles, who also had 14 turnovers in their first five games of the year. On October 22, 2012, Crennel named Quinn as the starting quarterback for the Chiefs following their bye week. Cassel was deemed healthy enough to play, but still given the backup role.{{Cite web |date=October 22, 2012 |title=Quinn to start Sunday for Chiefs |url=https://www.abc10.com/article/sports/nfl/quinn-to-start-sunday-for-chiefs/103-364764790 |url-status=live |archive-url=https://web.archive.org/web/20221016204253/https://www.abc10.com/article/sports/nfl/quinn-to-start-sunday-for-chiefs/103-364764790 |archive-date=October 16, 2022 |access-date=October 16, 2022 |website=abc10.com |language=en-US}}

On March 13, 2013, sources close to the Chiefs reported they intended to trade or release Cassel.{{Cite web |date=March 13, 2013 |title=Matt Cassel on Kansas City Chiefs' trading block |url=https://www.nfl.com/news/matt-cassel-on-kansas-city-chiefs-trading-block-0ap1000000150348 |url-status=live |archive-url=https://web.archive.org/web/20220131041640/https://www.nfl.com/news/matt-cassel-on-kansas-city-chiefs-trading-block-0ap1000000150348 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=NFL.com}} The next day, he was released.{{Cite web |date=March 14, 2013 |title=Matt Cassel released by Kansas City Chiefs |url=https://www.nfl.com/news/matt-cassel-released-by-kansas-city-chiefs-0ap1000000150655 |url-status=live |archive-url=https://web.archive.org/web/20220131041624/https://www.nfl.com/news/matt-cassel-released-by-kansas-city-chiefs-0ap1000000150655 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=NFL.com}}

File:Matt Cassel 2014 MV TC.jpg

On the same day he was released from the Chiefs, Cassel signed with the Minnesota Vikings.{{Cite web |last=Hanzus |first=Dan |date=March 14, 2013 |title=Matt Cassel agrees to Minnesota Vikings contract |url=https://www.nfl.com/news/matt-cassel-signs-minnesota-vikings-contract-0ap1000000150832 |url-status=live |archive-url=https://web.archive.org/web/20220131041620/https://www.nfl.com/news/matt-cassel-signs-minnesota-vikings-contract-0ap1000000150832 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=NFL.com}}

On September 27, it was announced that Cassel would get his first start as a Viking in Week 4 against the Pittsburgh Steelers due to a rib injury to starting quarterback Christian Ponder.{{Cite web |date=September 27, 2013 |title=Matt Cassel to start for Vikings over Christian Ponder |url=https://www.nfl.com/news/matt-cassel-to-start-for-vikings-over-christian-ponder-0ap2000000251325 |url-status=live |archive-url=https://web.archive.org/web/20220131041625/https://www.nfl.com/news/matt-cassel-to-start-for-vikings-over-christian-ponder-0ap2000000251325 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=NFL.com}} The Vikings won the game 34–27.{{Cite web |title=Pittsburgh Steelers at Minnesota Vikings – September 29th, 2013 |url=https://www.pro-football-reference.com/boxscores/201309290min.htm |url-status=live |archive-url=https://web.archive.org/web/20170811182755/https://www.pro-football-reference.com/boxscores/201309290min.htm |archive-date=August 11, 2017 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} Due to another injury to Ponder, Cassel received his third start of the season Week 14 against the Baltimore Ravens. Despite a two-touchdown, zero interception performance, the Vikings lost by a score of 29–26 during a heavy snow game.{{Cite web |title=Minnesota Vikings at Baltimore Ravens – December 8th, 2013 |url=https://www.pro-football-reference.com/boxscores/201312080rav.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070721/https://www.pro-football-reference.com/boxscores/201312080rav.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}} Cassel would remain the starting quarterback the rest of the season where the Vikings finished with a 5–10–1 record and Cassel either played the whole game or came in to rally the Vikings from behind in all five victories.{{Cite web |title=2013 Minnesota Vikings Statistics & Players |url=https://www.pro-football-reference.com/teams/min/2013.htm |url-status=live |archive-url=https://web.archive.org/web/20180126070703/https://www.pro-football-reference.com/teams/min/2013.htm |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}

On March 7, 2014, it was reported that Cassel had signed a new two-year deal for $10 million.{{Cite web |last=Goessling |first=Ben |date=March 7, 2014 |title=Matt Cassel, Vikings reach new deal |url=https://www.espn.com/nfl/story/_/id/10570780/minnesota-vikings-re-sign-matt-cassel-2-years |url-status=live |archive-url=https://web.archive.org/web/20180126125647/http://www.espn.com/nfl/story/_/id/10570780/minnesota-vikings-re-sign-matt-cassel-2-years |archive-date=January 26, 2018 |access-date=March 7, 2014 |website=ESPN.com}} It was later announced on August 25, 2014, that Cassel would be the starting quarterback over rookie Teddy Bridgewater and Ponder.{{Cite web |last=Rosenthal |first=Gregg |date=August 25, 2014 |title=Matt Cassel will start Week 1 for Minnesota Vikings |url=https://www.nfl.com/news/matt-cassel-will-start-week-1-for-minnesota-vikings-0ap3000000383374 |url-status=live |archive-url=https://web.archive.org/web/20220131041622/https://www.nfl.com/news/matt-cassel-will-start-week-1-for-minnesota-vikings-0ap3000000383374 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=NFL.com}} However, on September 21, 2014, Cassel broke his foot against the New Orleans Saints and was placed on injured reserve.{{Cite web |last=Goessling |first=Ben |date=September 24, 2014 |title=Vikings place QB Matt Cassel on IR |url=https://www.espn.com/nfl/story/_/id/11579931/minnesota-vikings-put-matt-cassel-injured-reserve |url-status=live |archive-url=https://web.archive.org/web/20180126125512/http://www.espn.com/nfl/story/_/id/11579931/minnesota-vikings-put-matt-cassel-injured-reserve |archive-date=January 26, 2018 |access-date=September 24, 2014 |website=ESPN.com}} In only three games, Cassel totaled 425 passing yards, three touchdowns, and four interceptions.{{Cite web |title=Matt Cassel 2014 Game Log |url=https://www.pro-football-reference.com/players/C/CassMa00/gamelog/2014 |url-status=live |archive-url=https://web.archive.org/web/20180126071018/https://www.pro-football-reference.com/players/C/CassMa00/gamelog/2014 |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}

On March 10, 2015, the Vikings traded Cassel along with a sixth round 2015 NFL draft pick to the Buffalo Bills in exchange for a 2015 fifth round pick and a seventh round pick in 2016.{{Cite web |last=Rodak |first=Mike |date=March 4, 2015 |title=Bills trade for Matt Cassel |url=https://www.espn.com/nfl/story/_/id/12419545/buffalo-bills-get-matt-cassell-trade-minnesota-vikings |url-status=live |archive-url=https://web.archive.org/web/20171109134716/http://www.espn.com/nfl/story/_/id/12419545/buffalo-bills-get-matt-cassell-trade-minnesota-vikings |archive-date=November 9, 2017 |access-date=October 16, 2022 |website=ESPN.com}}{{Cite web |date=March 10, 2015 |title=Bills officially acquire QB Cassel from Vikings in trade |url=https://www.buffalobills.com/news/bills-officially-acquire-qb-cassel-from-vikings-in-trade-15020071 |url-status=live |archive-url=https://web.archive.org/web/20190222095406/https://www.buffalobills.com/news/bills-officially-acquire-qb-cassel-from-vikings-in-trade-15020071 |archive-date=February 22, 2019 |access-date=June 26, 2019 |website=BuffaloBills.com}} Cassel was involved in a three-way quarterback competition between former Bills first round pick EJ Manuel and former Ravens backup Tyrod Taylor. After losing the competition to Taylor, Cassel was released by the Bills on September 5, 2015.{{Cite web |last=Orr |first=Conor |date=September 5, 2015 |title=Buffalo Bills release QB Matt Cassel |url=https://www.nfl.com/news/buffalo-bills-release-qb-matt-cassel-0ap3000000523174 |url-status=live |archive-url=https://web.archive.org/web/20220131041622/https://www.nfl.com/news/buffalo-bills-release-qb-matt-cassel-0ap3000000523174 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=NFL.com}} However, he was re-signed three days later to back up Taylor.{{Cite web |last=Hanzus |first=Dan |date=September 8, 2015 |title=Bills re-sign Matt Cassel to back up Tyrod Taylor |url=https://www.nfl.com/news/bills-re-sign-matt-cassel-to-back-up-tyrod-taylor-0ap3000000524045 |url-status=live |archive-url=https://web.archive.org/web/20220131041618/https://www.nfl.com/news/bills-re-sign-matt-cassel-to-back-up-tyrod-taylor-0ap3000000524045 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=NFL.com}} Cassel was credited as the Bills' starting quarterback for the season opener due to him taking the team's first snap on offense in the wildcat formation with Taylor lined up at wide receiver.{{Cite web |last=Alper |first=Josh |date=September 13, 2015 |title=Matt Cassel "starts" at quarterback for the Bills |url=https://profootballtalk.nbcsports.com/2015/09/13/matt-cassel-starts-at-quarterback-for-the-bills/ |url-status=live |archive-url=https://web.archive.org/web/20220901205349/https://profootballtalk.nbcsports.com/2015/09/13/matt-cassel-starts-at-quarterback-for-the-bills/ |archive-date=September 1, 2022 |access-date=October 16, 2022 |website=ProFootballTalk |language=en-US}}

File:Matt Cassel 2015.jpg

On September 22, 2015, Cassel was traded to the Dallas Cowboys after Tony Romo suffered a broken collarbone. In addition to Cassel, the Cowboys also received Buffalo's 2017 seventh round pick (#228-Joey Ivie) in exchange for Dallas' 2017 fifth round pick (#171-Nathan Peterman).{{Cite web |date=September 22, 2015 |title=Cowboys trade for Bills QB Matt Cassel |url=https://www.nfl.com/news/cowboys-trade-for-bills-qb-matt-cassel-0ap3000000536885 |url-status=live |archive-url=https://web.archive.org/web/20200509235908/http://www.nfl.com/news/story/0ap3000000536885/article/cowboys-trade-for-bills-qb-matt-cassel |archive-date=May 9, 2020 |access-date=January 30, 2022 |website=NFL.com}}

Although Brandon Weeden was expected to start, the Cowboys covered themselves by also trading for Cassel. After Weeden lost the three games he started, Cassel replaced him as the starting quarterback while the injured Romo continued to rehab.{{Cite web |last=Werder |first=Ed |date=October 13, 2015 |title=Source: Cowboys will start Matt Cassel at QB after bye week |url=https://www.espn.com/dallas/nfl/story/_/id/13881009/matt-cassel-start-qb-dallas-cowboys-bye-week |url-status=live |archive-url=https://web.archive.org/web/20170107001518/http://www.espn.com/dallas/nfl/story/_/id/13881009/matt-cassel-start-qb-dallas-cowboys-bye-week |archive-date=January 7, 2017 |access-date=December 23, 2015 |website=ESPN.com}} Cassel was never able to have any sustained offensive success and was prone to critical errors. On December 19, after a disastrous showing against the New York Jets, Cassel was benched and replaced by Kellen Moore for the game and the rest of the season.{{Cite web |last=Schwab |first=Frank |date=December 20, 2015 |title=Matt Cassel benched, Kellen Moore is Cowboys' fourth QB this year |url=https://sports.yahoo.com/blogs/nfl-shutdown-corner/matt-cassel-benched--kellen-moore-is-cowboys--fourth-qb-this-year-022909458.html |url-status=dead |archive-url=https://web.archive.org/web/20151223133602/http://sports.yahoo.com/blogs/nfl-shutdown-corner/matt-cassel-benched--kellen-moore-is-cowboys--fourth-qb-this-year-022909458.html |archive-date=December 23, 2015 |access-date=December 23, 2015 |website=Yahoo! Sports}} In his seven starts and eight appearances, Cassel posted a 1–6 record, 1,276 passing yards, five touchdowns, and seven interceptions.{{Cite web |title=Matt Cassel 2015 Game Log |url=https://www.pro-football-reference.com/players/C/CassMa00/gamelog/2015 |url-status=live |archive-url=https://web.archive.org/web/20180126071044/https://www.pro-football-reference.com/players/C/CassMa00/gamelog/2015 |archive-date=January 26, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}

On Cassel's last play before being benched for Moore, he became the first quarterback in over twelve years to throw an interception that was also flagged for intentional grounding.{{Cite web |last=Emert |first=Jacob |date=December 19, 2015 |title=Matt Cassel double dips for intentional grounding and an interception – on the same play |url=https://www.washingtonpost.com/news/early-lead/wp/2015/12/19/matt-cassel-double-dips-for-intentional-grounding-and-an-interception-on-the-same-play/ |url-status=live |archive-url=https://web.archive.org/web/20151222233618/https://www.washingtonpost.com/news/early-lead/wp/2015/12/19/matt-cassel-double-dips-for-intentional-grounding-and-an-interception-on-the-same-play/ |archive-date=December 22, 2015 |access-date=March 29, 2019 |language=en |newspaper=Washington Post}} The play was designed to be a wide receiver bubble screen, but Cassel held onto the ball after a pump-fake, then turned to look at the other side of the field. Forced to scramble to get away from the immediate pressure, thanks largely to most of the Dallas offensive linemen moving to the left side of the field to block for the presumed wide receiver screen, Cassel stumbled and nearly fell over. Trying to salvage the play, Cassel threw the ball towards the right sideline. No Dallas receiver was in the area, and the ball failed to reach the sideline and was intercepted by Darrelle Revis. On top of the intentional grounding call against Cassel, there was also an illegal lineman downfield call against Dallas, as several offensive linemen had run downfield to block for what they assumed was a quick screen pass to a receiver. Both penalties were declined so that the interception would stand.{{Cite web |title=New York Jets at Dallas Cowboys – December 19th, 2015 |url=https://www.pro-football-reference.com/boxscores/201512190dal.htm |url-status=live |archive-url=https://web.archive.org/web/20180119120338/https://www.pro-football-reference.com/boxscores/201512190dal.htm |archive-date=January 19, 2018 |access-date=January 25, 2018 |website=Pro Football Reference |language=en}}

Cassel signed with the Tennessee Titans on March 10, 2016.{{Cite web |last=Wyatt |first=Jim |date=March 10, 2016 |title=Titans Agree to Terms with Veteran QB Matt Cassel |url=https://www.tennesseetitans.com/news/titans-agree-to-terms-with-veteran-qb-matt-cassel-16915874 |url-status=live |archive-url=https://web.archive.org/web/20220131041618/https://www.tennesseetitans.com/news/titans-agree-to-terms-with-veteran-qb-matt-cassel-16915874 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=Tennessee Titans}}

During a Week 16 38–17 road loss to the Jacksonville Jaguars on Christmas Eve, Cassel entered the game in the third quarter after starter Marcus Mariota suffered a leg injury, completing 13-of-24 passes for 124 yards, a touchdown, and an interception.{{Cite web |last=Wyatt |first=Jim |date=December 24, 2016 |title=Titans Lose to Jaguars as Mariota Suffers Fractured Fibula |url=https://www.tennesseetitans.com/news/titans-lose-to-jaguars-as-mariota-suffers-fractured-fibula-18332278 |url-status=live |archive-url=https://web.archive.org/web/20220131041622/https://www.tennesseetitans.com/news/titans-lose-to-jaguars-as-mariota-suffers-fractured-fibula-18332278 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=Tennessee Titans}} Due to Mariota's injury, Cassel started in the regular-season finale against the Houston Texans, completing 16-of-26 passes for 150 yards, a touchdown, and an interception as the Titans won 24–17.{{Cite web |last=Wyatt |first=Jim |date=January 1, 2017 |title=Titans Beat Texans, Finish Season with 9–7 Mark |url=https://www.tennesseetitans.com/news/titans-beat-texans-finish-season-with-9-7-mark-18371418 |url-status=live |archive-url=https://web.archive.org/web/20220131041624/https://www.tennesseetitans.com/news/titans-beat-texans-finish-season-with-9-7-mark-18371418 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=Tennessee Titans}}{{Cite web |last=Wyatt |first=Jim |date=December 25, 2016 |title=Matt Cassel Ready to Step in for Titans |url=https://www.tennesseetitans.com/news/matt-cassel-ready-to-step-in-for-titans-18340801 |url-status=live |archive-url=https://web.archive.org/web/20220131041620/https://www.tennesseetitans.com/news/matt-cassel-ready-to-step-in-for-titans-18340801 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=Tennessee Titans}}

On March 2, 2017, Cassel signed a two-year, $5.25 million contract extension with the Titans.{{Cite web |last=Wyatt |first=Jim |date=March 2, 2017 |title=Titans Agree to Terms with Veteran QB Matt Cassel |url=https://www.tennesseetitans.com/news/titans-agree-to-terms-with-veteran-qb-matt-cassel-18602523 |url-status=live |archive-url=https://web.archive.org/web/20220131041627/https://www.tennesseetitans.com/news/titans-agree-to-terms-with-veteran-qb-matt-cassel-18602523 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=Tennessee Titans}}

During a Week 4 57–14 road loss to the Houston Texans, Mariota suffered a hamstring injury in the third quarter and was relieved by Cassel. He finished the game completing four of 10 passes for 21 yards and two interceptions.{{Cite web |date=October 1, 2017 |title=Titans' Matt Cassel: Comes in in relief of Mariota |url=https://www.cbssports.com/fantasy/football/news/titans-matt-cassel-comes-in-in-relief-of-mariota/ |url-status=live |archive-url=https://web.archive.org/web/20171002011511/https://www.cbssports.com/fantasy/football/news/titans-matt-cassel-comes-in-in-relief-of-mariota/ |archive-date=October 2, 2017 |access-date=October 1, 2017 |website=CBS Sports}} Due to Mariota's injury, Cassel started the game against the Miami Dolphins on October 8, completing 21 of 32 passes for 141 yards and a touchdown as the Titans lost on the road by a score of 16–10.{{Cite web |last=Wyatt |first=Jim |date=October 8, 2017 |title=Cassel Can't Rescue Titans; Latest on Marcus Mariota |url=https://www.tennesseetitans.com/news/cassel-can-t-rescue-titans-latest-on-marcus-mariota-19530798 |url-status=live |archive-url=https://web.archive.org/web/20220131041620/https://www.tennesseetitans.com/news/cassel-can-t-rescue-titans-latest-on-marcus-mariota-19530798 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=Tennessee Titans}}

On March 9, 2018, Cassel was released by the Titans.{{Cite web |last=Wyatt |first=Jim |date=March 9, 2018 |title=Titans Plan to Release Cassel, Searcy, Weems |url=https://www.tennesseetitans.com/news/titans-plan-to-release-cassel-searcy-weems-20435345 |url-status=live |archive-url=https://web.archive.org/web/20220116011451/https://www.tennesseetitans.com/news/titans-plan-to-release-cassel-searcy-weems-20435345 |archive-date=January 16, 2022 |access-date=January 30, 2022 |website=Tennessee Titans}}

On April 4, 2018, Cassel signed a one-year, $1,105,000 contract with the Detroit Lions.{{Cite web |last=Knoblauch |first=Austin |date=April 4, 2018 |title=Veteran QB Matt Cassel signing with Detroit Lions |url=https://www.nfl.com/news/veteran-qb-matt-cassel-signing-with-detroit-lions-0ap3000000924938 |url-status=live |archive-url=https://web.archive.org/web/20220131041626/https://www.nfl.com/news/veteran-qb-matt-cassel-signing-with-detroit-lions-0ap3000000924938 |archive-date=January 31, 2022 |access-date=January 30, 2022 |website=NFL.com}}

During the season opener against the New York Jets, Cassel made his Lions debut coming in relief of Matthew Stafford in the 48–17 blowout loss.{{Cite news |last=Alper |first=Josh |date=September 11, 2018 |title=Jets open season with 48–17 rout of Lions |url=https://profootballtalk.nbcsports.com/2018/09/10/jets-open-season-with-48-17-rout-of-lions/ |url-status=live |archive-url=https://web.archive.org/web/20181002020211/https://profootballtalk.nbcsports.com/2018/09/10/jets-open-season-with-48-17-rout-of-lions/ |archive-date=October 2, 2018 |access-date=October 1, 2018 |work=ProFootballTalk |language=en-US}} Cassel appeared in one other game in the 2018 season, a Week 16 27–9 loss to his former team, the Minnesota Vikings.{{Cite web |title=Minnesota Vikings at Detroit Lions – December 23rd, 2018 |url=https://www.pro-football-reference.com/boxscores/201812230det.htm |url-status=live |archive-url=https://web.archive.org/web/20190123010633/https://www.pro-football-reference.com/boxscores/201812230det.htm |archive-date=January 23, 2019 |access-date=January 24, 2019 |website=Pro Football Reference |language=en}}

In February 2007, Cassel married his longtime girlfriend Lauren Killian, a former USC volleyball player.{{Cite web |last=Crouse |first=Karen |date=January 9, 2011 |title=For Cassels, Athletics Are Part of the Family |url=http://fifthdown.blogs.nytimes.com/2011/01/09/for-cassels-athletics-are-part-of-the-family/?_r=0 |url-status=live |archive-url=https://web.archive.org/web/20180314104840/https://fifthdown.blogs.nytimes.com/2011/01/09/for-cassels-athletics-are-part-of-the-family/?_r=0 |archive-date=March 14, 2018 |access-date=January 4, 2014 |website=New York Times}} Carson Palmer was his best man.{{Cite news |last=Hohler |first=Bob |date=September 14, 2008 |title=After years as a backup, he hands off clipboard |url=http://www.boston.com/sports/football/patriots/articles/2008/09/14/after_years_as_a_backup_he_hands_off_clipboard/?page=full |url-status=live |archive-url=https://web.archive.org/web/20081214222556/http://www.boston.com/sports/football/patriots/articles/2008/09/14/after_years_as_a_backup_he_hands_off_clipboard/?page=full |archive-date=December 14, 2008 |access-date=December 11, 2008 |work=Boston Globe}}

Cassel's brother Jack pitched for the San Diego Padres and Houston Astros.{{Cite web |title=Jack Cassel Stats |url=https://www.baseball-reference.com/players/c/casseja01.shtml |url-status=live |archive-url=https://web.archive.org/web/20170915070633/https://www.baseball-reference.com/players/c/casseja01.shtml |archive-date=September 15, 2017 |access-date=January 2, 2018 |website=Baseball-Reference.com |publisher=Sports Reference, LLC |language=en}} His brother Justin pitched for the Chicago White Sox farm system for six seasons.{{Cite web |title=Justin Cassel Minor, Fall, Winter & Independent Leagues Statistics & History |url=https://www.baseball-reference.com/register/player.fcgi?id=cassel001jus |url-status=live |archive-url=https://web.archive.org/web/20180103193344/https://www.baseball-reference.com/register/player.fcgi?id=cassel001jus |archive-date=January 3, 2018 |access-date=January 2, 2018 |website=Baseball-Reference.com |publisher=Sports Reference, LLC |language=en}}

Cassel is the son of Emmy-winning set decorator Barbara Cassel and Greg Cassel.

On the night of January 26, 2012, a fire broke out in a family's house in the village of Loch Lloyd, Missouri. Cassel, seeing smoke from the fire, ran to their house to alert them. The family was able to make it out of the fire alive.{{Cite web |last=Thorman |first=Joel |date=January 28, 2012 |title=Chiefs' Matt Cassel Helps Neighbors Escape House Fire |url=https://www.arrowheadpride.com/2012/1/28/2754203/chiefs-matt-cassel-house-fire |url-status=live |archive-url=https://web.archive.org/web/20121207121828/http://www.arrowheadpride.com/2012/1/28/2754203/chiefs-matt-cassel-house-fire |archive-date=December 7, 2012 |access-date=October 16, 2022 |website=Arrowhead Pride |language=en}}

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