He was due a $2 million roster bonus.
Matthews was scheduled to make $3.75 million in base salary and count $5.75 million against the salary cap after signing a two-year, $9.25 million deal last offseason.
Matthews, 33, started 13 games in his only season in Los Angeles after 10 seasons with the Packers. He missed three games with a broken jaw.
He made 37 tackles, nine tackles for loss, eight sacks, 11 quarterback hits, two forced fumbles and three pass breakups in 2019.
In his 11-year career, Matthews has 519 tackles, 91.5 sacks, 130 tackles for loss and 200 quarterback hits.