The signing of Lynch, 27, is another indication the Jaguars are going to use more 3-4 looks in 2020; the team has run the 4-3 defense since coach Gus Bradley was hired in 2013. Todd Wash came to Jacksonville from Seattle with Bradley as the defensive line coach and was promoted to defensive coordinator in 2016, and coach Doug Marrone retained Wash as the defensive coordinator when he was hired in 2017.
The Jaguars drafted Josh Allen last season and K'Lavon Chaisson last month, both of whom can play both defensive end and outside linebacker. After the draft, Marrone said the Jaguars would employ some 3-4 looks with the strongside linebacker playing up on the line of scrimmage.
Lynch spent the past two years with the Chicago Bears and appeared in 29 regular-season games with five sacks.
While Lynch missed only three regular-season games, the veteran defender sat out extended portions of training camp because of injuries each of the past two summers.
Lynch registered 12.5 sacks over his first two years in the league but has just 7.5 sacks over the past four seasons.
ESPN's Jeff Dickerson contributed to this report.