The starting defensive tackle hurt his right hand in practice Thursday, and coach Chan Gailey said Williams went to be examined by team doctors for precautionary reasons. Gailey added that he doesn't believe the injury is serious.
Williams was hurt an hour into practice while the defensive linemen were taking part in individual drills. Taking off the wrap he already had on his hand, Williams pointed to his palm as he was examined by trainers.
He eventually had his hand wrapped extensively before being escorted to the locker room.
The Bills are already banged up eight days into camp in suburban Rochester.
The team began Thursday's session with 14 players not practicing because they were either injured or given the day off.
Gailey updated the status of Ed Wang, saying the rookie left tackle will miss between four and eight weeks after having surgery on his left thumb this week. The coach also revealed that rookie receiver David Nelson is out indefinitely with what Gailey believed was a pulled hamstring.
Then there was tight end Derek Schouman who missed practice Thursday to rest what Gailey would only refer to as an injury that's been bothering the player since the start of camp.
Also in the group of injured players was starting linebacker Chris Kelsay, who has been out since hurting his right shoulder on the first day of practice. Defensive end Spencer Johnson has been out since hurting his leg on Friday.
Posluszny said he expects to miss at least another week or two.
"I feel really good, but we're taking it slow," he said. "No reason to rush it yet."
Gailey wasn't too concerned about the amount of injured players, saying that's what happens at training camp.
"You deal with it and you go on," he said. "You can't control all of that. I mean, you could. You could come out and walkthrough every day, but you wouldn't get anything done. It's a tough game for tough people."
Bills camp has been far more physical under Gailey, who took over in January after Dick Jauron was fired. Unlike Jauron, who preferred walkthroughs and little hitting, Gailey has had his players practicing in pads throughout camp and even allowed tackling during team goal-line sessions.