With injuries piling up along the Washington Redskins offensive line, the team signed former Raven Tony Bergstrom to the active roster Wednesday. The Redskins released defensive lineman A.J. Francis (Maryland) as a corresponding move. Bergstrom, 31, has played in 44 games and made four career starts. Listed at 6 feet 5 and 315 pounds, he was a third-round draft pick by the Oakland Raiders in 2012. Bergstrom has spent this season on and off with the Ravens. Bergstrom, who can play center or guard, was active for four games until he was released Monday. Left tackle Trent Williams (knee), right guard Brandon Scherff (knee/back), center Spencer Long (both knees) and backup offensive tackle Ty Nsekhe (core muscle) are dealing with injuries on the Redskins offensive line.Other players listed on the team's injury list include linebacker Preston Smith (groin), linebacker Zach Brown (back), cornerback Josh Norman (rib), offensive tackle Morgan Moses (both ankles), linebacker Mason Foster (shoulder), safeties Deshazor Everett (hamstring) and Stefan McClure (knee/hamstring), cornerback Fabian Moreau (hamstring) and guard Tyler Catalina (concussion).