Updated Sep 13, 2015 at 1:35p ET
ORCHARD PARK, N.Y. (AP) Buffalo Bills safety Corey Graham has been ruled out with a possible concussion after being kneed in the head by Indianapolis running back Frank Gore.
Graham was hurt on the first offensive play from scrimmage in the teams' season opener on Sunday. Gore took a pitch left and was tripped up by Graham just as he turned the corner. As Graham slid to the turf, he was struck in the helmet by Gore's left knee.
Graham was wobbly as he attempted to get up, and then nearly collapsed.
He sat on the field for a few moments before being helped up and escorted off to be examined for a possible concussion.
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