Coach Mike Shanahan said Trent Williams was limited in practice Friday, but he would not rule out the Redskins’ second-year left tackle for Sunday’s game against San Francisco. Shanahan said Williams will be a game-time decision.

>> Tight end Fred Davis, safety Oshiomogho Atogwe and cornerback Phillip Buchanon will be listed as questionable for Sunday’s contest, Shanahan said. Atogwe didn’t practice Friday, and Buchanon and Davis were limited.

>> Shanahan said Rex Grossman has practiced primarily with the scout team since he was demoted last month, as is common with a team’s No. 2 quarterback.