Cardinals rookie linebacker Alex Okafor out for season with biceps injury
Cardinals head coach Bruce Arians made the announcement on his weekly radio show on Tuesday.
Okafor was the team's fourth-round pick in April's draft.
The team signed Vic So'oto on Tuesday and promoted Dontay Moch from the practice squad to add some depth at linebacker. The team had only two outside linebackers left on the active roster before those roster moves.