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Buffalo Bills right guard Kraig Urbik's left foot is in a walking boot, jeopardizing his ability to play Sunday against the Jacksonville Jaguars at EverBank Field.

J.J. 'Unga, signed three weeks ago off the Baltimore Ravens' practice squad, absorbed Urbik's reps today in practice.

"I think it's going to be a game-time decision," Doug Marrone said of Urbik, "and I won't be able to update you during the week, saying, 'He's closer,' or 'He's not closer.' I really think it'll go all the way to the end."

Urbik's foot was sore after Sunday's loss to the Tampa Bay Buccaneers, and it didn't improve the next few days. 'Unga made his NFL debut Sunday, playing seven snaps in Urbik's spot.

Defensive tackle Kyle Williams took his usual day off to rest his surgically repaired Achilles.

Inside linebacker Kiko Alonso was limited today with a knee injury. Marrone said Alonso was being rested as a precaution.

Reserve cornerback Brandon Smith suffered an ankle injury during today's practice.