Portis ruled out vs. Cowboys

ASHBURN, Va. -- Washington Redskins running back Clinton Portis will miss his second straight game as he recovers from a concussion.

Coach Jim Zorn on Thursday ruled Portis out for Sunday's game at Dallas.

Portis has not been able to practice since he was injured in a helmet-to-helmet hit against the Atlanta Falcons.

Ladell Betts is set to start for Portis for the second consecutive week.

Zorn says defensive tackle Albert Haynesworth remains a game-time decision with a sprained left ankle. The coach says Haynesworth is "coming along" and that the ankle's swelling is starting to go down.