Mathieu was cut just hours before $5.75 million of his 2018 salary and $8 million of his 2019 salary were to be guaranteed on Wednesday afternoon, the first day of the league year. Mathieu was also due a $5 million roster bonus on March 16.
Mathieu was asked by the Cardinals to take a pay cut on Thursday but declined.
The news was first reported by Fox Sports.
When healthy, Mathieu was considered one of most dynamic defenders in the NFL. He had a reputation for having a nose for the football and played with a reckless abandon that helped shape who he was as a safety. The 5-foot-9 Mathieu became known as one of the best nickel defenders in the league, preferring to play in the box where he felt he could make an impact on every play rather than roaming the secondary.
However, Mathieu’s promising career in Arizona was marred by injuries.
The 25-year-old Mathieu finished three of his five seasons on injured reserve thanks to two major knee injuries — a torn ACL and LCL in 2013, and an ACL in 2015. Mathieu’s 2015 knee injury derailed the best season of his career. When he went down in Week 15 — the game the Cardinals clinched their last NFC West title — he was in the conversation for Defensive Player of the Year. He was named a first-team All-Pro and to the Pro Bowl that season.
Mathieu’s 2016 season was cut short by a shoulder injury that landed him on injured reserve.
Last season was the first that Mathieu played in all 16 games as he continued to recover mentally and physically from the last couple years of injuries.
He was suspended by LSU before the 2012 season for failing drug tests and then was arrested that October before leaving school to begin preparing for the NFL draft. He missed the entire 2012 season, leading to him falling to the Cardinals in the third round of the 2013 draft.
In 66 career games, Mathieu has 303 tackles, 25 pass break ups, 22 passes defensed, 11 interceptions, four sacks and four forced fumbles.