Baltimore Ravens wide receiver and kick returner Jacoby Jones left Thursday's game against the Denver Broncos because of an apparent knee injury.
Also, Ravens right tackle Michael Oher left the game in the second quarter with an ankle injury. His return was questionable.
Jones' teammate Brynden Trawick collided with Jones when Jones was attempting to field a punt. Jones appeared to hyper-extending his right knee.
He left the field and went to the locker room to have it examined.
The Ravens said it was doubtful he would return to the game.
Jones had three catches for 24 yards on Thursday before leaving the game.
Last season, Jones had 30 catches for 406 yards last season, but was more important as a kick and punt returner. He averaged 9.2 yards per punt return and 30.7 yards on kickoff returns in 2012. He returned two kicks for touchdowns and one punt for a score.