PITTSBURGH — Steelers quarterback Ben Roethlisberger has a concussion but is expected to play Sunday at Baltimore as long as he continues to pass the daily tests given to players who have sustained the injury.

Coach Mike Tomlin said today he plans to go into the game with Roethlisberger and second-year player Dennis Dixon as his only quarterbacks. A third, inexperienced quarterback will be signed, but Tomlin said he won't be ready to play.

Backup quarterback Charlie Batch broke his left wrist during the 27-24 loss in Kansas City on Sunday and will have surgery Wednesday.

Pittsburgh also will be without left guard Chris Kemoeatu (sprained MCL), and Tomlin said safety Troy Polamalu (left knee) is "questionable, at best."