LeSean McCoy injured his hamstring during Tuesday night's practice session with the Browns, and the Bills are not yet certain how severe the injury is.
Buffalo Bills running back LeSean McCoy left practice early with a heavy limp on Tuesday evening, and will have a MRI in order to determine the extent of a left hamstring injury.
Bills head coach Rex Ryan would not disclose anything about the injury beyond the fact that it was a hamstring issue, that it would require imaging, and that the muscle was intact and not separated from the bone.