Bills coach Chan Gailey told reporters Monday that there was a possibility Williams could miss the remainder of the season, and he would visit a specialist in North Carolina to examine his nagging foot injury, which had sidelined him the past three games. Williams recorded nine tackles in five games this year after posting a career high in tackles (77) and sacks (5.5) in 2010.
"You never breathe easy when you lose an All-Pro player," Gailey told the team's official website. "That is a huge loss for our football team when he's not in the game. Not only by his play, but by his leadership and the energy he brings to the game."
The Bills also announced Tuesday that they have agreed to terms on a contract with kicker Dave Rayner, who will fill in for injured veteran Rian Lindell.
Rayner has played for seven teams over parts of six NFL seasons, including a one-game stint in Oakland while filling in for an injured Sebastian Janikowski in a 28-0 loss to Kansas City last month.
There's no timetable on how long Lindell will be out. The possibility of the player being placed on injured reserve hasn't been discussed.
The Associated Press contributed to this report.