Washington Redskins running back Clinton Portis will be placed on injured reserve with a groin injury, Jason Reid of the Washington Post reports.

Portis was thought to be done for the season when he originally injured his groin in a Week 4 win over the Philadelphia Eagles. Portis missed five games, but returned to carry the ball five times for 32 yards against the Tennessee Titans.

Swelling sent Portis for an MRI, which reportedly didn't reveal any new damage to the groin, leaving Portis optimistic that he'd be able to play this Sunday against Minnesota.

"Hopefully, the swelling go down," Portis said "The Mike Wise Show" on 106.7 The Fan on Tuesday. "The MRI didn't reveal anything new, so that was a great thing. That was great news. Right now, dealing with swelling, and hopefully that go down."

Portis, who turns 30 next September, has three years remaining on his current contract, which includes base salaries in excess of $8 million per season and will likely need to be restructured for him to remain with the franchise.

Since being acquired from the Denver Broncos in 2004, Portis has 6,824 yards and 46 touchdowns rushing, with 176 receptions for 1,340 yards and 3 touchdowns receiving. Portis ranks second on the Redskins' all-time rushing list, trailing Hall of Fame running back John Riggins by 648 yards.

With Portis on IR, and Ryan Torain dealing with a hamstring injury, the Redskins' rushing load will be carried by Keiland Williams and James Davis, who was signed off the practice squad earlier this week. The Redskins also added first-year back Kehstan Moore to the practice squad this week.