Jack has been dealing with a knee injury that ultimately will end up ending his 2019 season with four games left in the year.
The team announced it has promoted LB Joe Giles-Harris from the practice squad to take Jack’s place on the active roster.
Jack, 24, wound up being selected by the Jaguars with the No. 36 overall pick in the 2016 NFL Draft after they traded up to acquire him. He was entering the final year of his four-year, $6.3 million rookie contract when he signed a four-year, $57 million extension with $33 million guaranteed.
Jack will make base salaries of $12.75 and $9.5 million over the next two seasons.
In 2019, Jack appeared in 11 games for the Jaguars and recorded 66 total tackles, half a sack, one interception and four pass defenses. He was rated by Pro Football Focus as the No. 74 linebacker out of 86 qualifying players.