Lost in the hullabaloo that was the final moments of the Buffalo Bills' 37-31 loss to the New England Patriots on Sunday was the fact that running back Fred Jackson sustained a head injury on the team's final drive - and the injury is serious enough that it may affect his availability for Thursday night's home game against the Miami Dolphins.

Jackson fumbled late in the fourth quarter - his second of the day - when Patriots linebacker Brandon Spikes put a shoulder into Jackson's upper back. That hit also left Jackson dazed; he left the field on his feet with trainers by his side, but did not return to the game.

After the game was over, Bills head coach Chan Gailey stopped short of saying that Jackson had suffered a concussion, but told reporters that it had been classified as a head injury. This morning, the team's official Twitter feed published this as Gailey spoke live on WGR 550's The Howard Simon Show:

Gailey on Fred Jackson: He was not feeling well on the plane, concussion-like symptoms. Will be evaluated, status unknown for the short week

Jackson scored two touchdowns and had 115 total yards from scrimmage on Sunday, but fumbled twice - including the aforementioned play on the last drive, which the Bills recovered. If he can't play on Thursday night, C.J. Spiller would be in line for a much bigger rushing load than he's gotten with both backs healthy, and Tashard Choice would once again factor into the backfield equation, as well.