UPDATE: Allen returned to the game
The Kansas City Chiefs lost offensive lineman Jeff Allen to an injury in Sunday's game against the Buffalo Bills.
Chiefs medical staff looking at Jeff Allen's lower left leg, now taking him off the field to the locker room. He's grimacing with each step.— Herbie Teope (@HerbieTeope) November 29, 2015
Jeff Allen has ankle injury. Chiefs are saying questionable return for him. We'll see— Adam Teicher (@adamteicher) November 29, 2015
Allen is arguably the Chiefs most important lineman. He can play guard and tackle but has been playing left guard with Ben Grubbs injured. Grubbs could be out for the season too so the Chiefs will be crossing their fingers with this Allen injury and hoping it's nothing serious.