Coach Chan Gailey said Friday that Kelsay will be a game-time decision after he was limited in practice. Kelsay missed two games earlier this season because of the injury.
Gailey wasn't as optimistic with offensive lineman Chris Hairston, who missed Sunday's game against Washington because of an ankle injury. Hairston is questionable a day after Gailey expressed hope that Hairston would be ready to play.
Receiver Donald Jones is expected to return after missing the past two games because of an ankle injury.
The Bills (5-2) and Jets (4-3) will face each other twice over the next four games.