The Denver Broncos have placed second-year safety Quinton Carter on injured reserve after he hurt his surgically repaired left knee last weekend.
The Broncos promoted rookie safety Duke Ihenacho from their practice squad to take his place, and they also promoted second-year linebacker Mike Mohamed to the active roster for Sunday's game against Oakland.
Starting middle linebacker Joe Mays was suspended for one game and fined $50,000 for an illegal hit on Houston quarterback Matt Schaub last week.
Carter started 10 games last season but a torn right hamstring at an indoor practice July 27 led doctors to discover he needed arthroscopic surgery on his left knee.
He returned Aug. 30 but played mostly on special teams this season with Rahim Moore and Mike Adams the starting safeties.