The Dallas Cowboys may get a break Sunday in Washington.
Redskins running back Clinton Portis could not practice Monday, the team's first practice back from their bye week.
Coach Jim Zorn says Portis is "50-50" for Sunday night's game against Dallas.
Portis sprained his knee during a loss to the Steelers.
He is second in the league in rushing with 955 yards on 200 carries.
