The Cardinals placed another outside linebacker on injured reserve on Monday.
Fitts saw some time on defense, but most of his playing time came on special teams. Fitts was credited with nine tackles in 13 games and he forced a fumble against the Giants in Week 15.
The Cardinals filled his roster spot by activating Lamon Gaillard. He was on the exempt list after leaving the team to be present for the birth of his child.
Gaillard has appeared in 13 games and made two starts this season.