ASHBURN, Va. (AP) - Washington Redskins left tackle Trent Williams remains unable to practice because of a knee injury.

Williams remained sidelined again Thursday because of a bone bruise in his right knee. He was hurt during Sunday's loss to the Cincinnati Bengals.

Coach Mike Shanahan did not rule out Williams for this week's game against the Tampa Bay Buccaneers. Jordan Black will start if Williams can't play.

Nickel cornerback Cedric Griffin also did not practice because of his hamstring injury.

Receiver Pierre Garcon was limited because of an injured right foot. Also limited were safety Brandon Meriweather and running back Evan Royster, each with a sprained knee.