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 the Oakland Raiders.
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. Carter only played 15 defensive snaps in three games, including just one Sunday, before aggravating his surgically repaired knee. Veteran Keith Brooking is expected to start at middle linebacker Sunday in a crucial matchup of 1-2 teams.
Running back Knowshon Moreno on Friday pleaded guilty to a driving while impaired charge and was given a 30-day suspended jail sentence and a year's probation in addition to community service and fines and court fees, KUSA-TV in Denver reported.
Police have said Moreno was driving 70 mph in a construction zone where the speed limit was 45 mph in February. He originally was charged with drunken driving and careless driving but pleaded guilty to the lesser charge.
Copyright 2012 by The Associated Press