ASHBURN, Va. -- Washington Redskins running back Clinton Portis continues to show symptoms from a concussion and will return to a specialist in Pittsburgh on Monday and Tuesday to evaluate his progress.
Portis was hurt Nov. 8 against Atlanta and will miss his fourth straight game Sunday when the Redskins host New Orleans.
Coach Jim Zorn said Friday that Portis "still has a little dizziness" when performing certain tasks.
Zorn said cornerback DeAngelo Hall remains doubtful for Sunday with a sprained right knee and will likely miss his second straight game.
Zorn is optimistic that defensive tackle Albert Haynesworth will return after missing two games with a sprained left ankle. Haynesworth is listed as questionable on the injury report.