The Buffalo Bills, featuring the NFL's worst run defense, may be without their best run defender when the team travels to Maryland this Sunday to take on the Baltimore Ravens. Nose tackle Kyle Williams did not practice with the team on Thursday, according to Chris Brown of BuffaloBills.com.

Williams is reportedly dealing with an ankle injury which limited his practice participation on Wednesday. In his fifth professional season, Williams has only missed two games since getting drafted by the Bills in 2006. Should he not be able to play Sunday, rookie Torell Troup and veteran Spencer Johnson would see much more time inside in the Bills' heavy run front.

Chan Gailey did, however, tell reporters that despite the injury, Williams has a "legitimate chance" to play Sunday.