Ravens tight end Ed Dickson sustained a knee injury during the first half of today's game against the San Diego Chargers.
He is doubtful to return, according to the team.
Dickson went to the locker room for further examination in the first half.
With Dickson sidelined, Dennis Pitta is being used in a full-time capacity.
Meanwhile, starting inside linebacker Dannell Ellerbe left the game with an ankle injury and hasn't returned.
In the second half, Brendon Ayanbadejo and Josh Bynes have divided up duties at inside linebacker.
Kick returner Jacoby Jones aggravated his preexisting ankle injury, but returned.