Green Bay Packers head coach Mike McCarthy told reporters that running back James Starks sustained a concussion in a car accident Monday.

Starks has since been placed in concussion protocol, though McCarthy reports his back is feeling "OK," according to Rob Demovsky of ESPN.

Starks didn't attend the team's practice on Wednesday and the car accident and concussion appear to be the cause.

The seventh-year pro has been used sparingly this season. He had just two carries for three yards in the Packers' most recent game on Sunday and has been passed on the depth chart by converted wide receiver Ty Montgomery.