Clinton Portis to be "limited" on Sunday

ASHBURN, Va. -- Washington Redskins running back Clinton Portis did not practice again Friday and will be used only "in a limited fashion" if he is able to play Sunday night against the Dallas Cowboys.

The NFL's second-leading rusher was able to watch practice -- unlike Wednesday and Thursday, when his sprained left knee kept him away from the field -- and was "getting some mental reps in case he has a chance to go," according to coach Jim Zorn.

Portis sprained the knee in the 23-6 loss to the Pittsburgh Steelers before last week's bye. He is questionable on the injury report.

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