ASHBURN, Va. — Washington Redskins cornerback Shawn Springs was unable to practice today and was listed as doubtful for Sunday's game against the Cleveland Browns.

Springs aggravated a calf injury near the end of today's practice. The injury caused Springs to miss the victory over Philadelphia two weeks ago, but he returned to play last week against St. Louis.

"He had some tightness in his calf muscle, so that'll be a game-time deal," coach Jim Zorn said. "He says he wants to play — don't know if he'll be fit to play. It's probably not good, but I'm the optimist."

Clinton Portis, the NFL's leading rusher, returned after missing Thursday's practice with a mild hip flexor. He is questionable.

"He ran around pretty good," Zorn said. "Nothing for him was absolute burst full-speed, but I saw him make some cuts both left and right."

Defensive end Jason Taylor, who also aggravated a calf injury this week, missed practice for the second day in a row and is questionable. Zorn said the calf is "a little swollen" but that he expects Taylor to play.

Safety Chris Horton (ankle) and cornerback Fred Smoot (groin) practiced and were listed as questionable. Tackle Chris Samuels (ankle) and cornerback Carlos Rogers (calf) are probable.