Karlos Williams concussion puts status for Bills vs. Titans in doubt

In a radio appearance on WGR 550 on Tuesday morning, Buffalo Bills general manager Doug Whaley told host Howard Simon that running back Karlos Williams suffered a concussion during Sunday's loss to the New York Giants, and that the Bills will be looking into free agent running backs as a result.

as per Doug Whaley, Karlos Williams suffered a concussion in game Sunday. Is undergoing concussion protocol. will have some RB's in today

— Howard WGR (@hsimon62) October 6, 2015

Williams' injury comes at a time when top tailback LeSean McCoy (hamstring) is telling people that he's holding himself out of the lineup until he is 100 percent healthy. The Bills have two other backs on the active roster - veteran Boobie Dixon and recent practice squad signing Cierre Wood - but more help will be needed if the Bills will be without McCoy and Williams for any length of time.

One of the most pleasant surprises on the young season for the Bills, Williams has 226 rushing yards, 46 receiving yards, and four touchdowns so far this season. If the Bills play against the Tennessee Titans this weekend without their top two tailbacks, their leading rushers heading into the game will be quarterback Tyrod Taylor (111 yards) and wide receiver Percy Harvin (32 yards).