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As the Bills try to recover from a close loss to the Pats and prepare to face the Dolphins on Thursday night, they may not have one of their top offensive weapons.

Running back Fred Jackson left the game late with a head injury.

“I don’t know if they’re calling it a concussion,” coach Chan Gailey said after the game. “I don’t know what the word is. I don’t know if it’s a concussion or not. They didn’t tell me.”

If Jackson can’t play, C.J. Spiller will once again carry the load. On Sunday, he had 13 touches for 131 yards.