RB Karlos Williams has concussion; Bills sign Dan Herron

Sunday’s game against the New York Giants was rookie running back Karlos Williams’ first crack at being a starter in the NFL.

General manager Doug Whaley revealed Williams’ injury Tuesday during his radio show on Buffalo’s WGR-AM.

That being said, Whaley did say that the team will bring in backs to work out this week in case Williams can’t go against Tennessee on Sunday. He will have to clear that before being allowed to return to action.

McCoy told reporters last week that he won’t play until he feels 100 percent after suffering a setback two weeks ago in his recovery from a hamstring injury.

For Buffalo, Herron will share the load with Anthony Dixon until McCoy and Williams get healthy enough to resume their roles as the team’s primary backs. He has also caught 22 passes for 230 yards.

Multiple reports have indicated that free agent RB Trent Richardson is one of the running backs working out for Buffalo today.

Selected in the sixth round of the 2012 draft by Cincinnati, Herron spent a little over a season with the Bengals before being signed by the Colts.

In order to make room for Herron, the Bills placed tight end MarQueis Gray on injured reserve with a fractured forearm.

A person familiar with the situation told The Associated Press that Richardson and Smith also worked out for the Bills.

Richardson was waived by the Colts in March.