The Cardinals defense suffered a blow despite having a bye last weekend.
The team announced that it had placed starting outside linebacker Alex Okafor (toe) on the non-football injury list. Defensive tackle Cory Redding (ankle) was placed on injured reserve.
Taking their places on the roster are outside linebacker Jason Babin and linebacker Gabe Martin.
Babin, a 12-year veteran, has 64.5 career sacks. He played in two games for the Ravens this season.
Martin was promoted from the practice squad.
No immediate information was available about how Okafor suffered his injury. The team didn’t have to produce an injury report last week, so it could have happened in practice, or it might have happened during the three days off over the weekend.