THE ASSOCIATED PRESS

ASHBURN, Va. -- Washington Redskins running back Clinton Portis was at the University of Pittsburgh Medical Center on Friday to have his concussion evaluated.

Portis saw the same doctors who examined Eagles back Brian Westbrook, who has sustained two concussions in the last month. Portis was hurt two weeks ago against Atlanta. He did not play last week against Denver and has been ruled out for Sunday's game at Dallas.

"We're going to make sure we take care of all the details. We're for Clinton getting well," Redskins coach Jim Zorn said. "Each day Clinton's done a great job of communicating how he's felt, and that's what it's going to take.

"I want to be involved with those conversations, not so much to see 'how fast can we get him back,' but just to make sure the young man is improving and getting better."

Portis gave his own update via Tweeter: "Hey fans! Trying to get healthy to finish the season strong, want to make sure there aren't lingering affects before returning to the field."

Defensive tackle Albert Haynesworth is questionable for Sunday because of a sprained left ankle. Haynesworth was unable to practice this week but tested his ankle on a treadmill Friday.

Zorn said Haynesworth remains a game-time decision.