"We dodged a bullet there," Buffalo general manager Buddy Nix said. "It's not a season ending injury. He won't need surgery. It'll be about two weeks."
Posluszny was hurt on the first play of the third quarter when he was one of three Bills defenders to bring down running back Ronnie Brown along the sideline. Posluszny sat on the field for several minutes before getting up on his own.
Trainers examined Posluszny's right knee before having him jog off the field. Posluszny returned a few minutes later and ran along the sideline while wearing what appeared to be a brace before he was escorted back to the locker room.
Following practice Monday, Coach Chan Gailey didn't disclose any details of the injury, except to say tests revealed it wasn't as severe as first feared. There's a possibility Posluszny might not be back until Oct. 24, when Buffalo returns from its bye week to play at Baltimore.
Buffalo was already thin at linebacker. Reggie Torbor did not play Sunday because of a chest injury, while Kawika Mitchell was placed on injured reserve Friday due to a foot injury.
ESPN NFL Insider Adam Schefter contributed to this report. Information from The Associated Press was used in this report.
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