Redskins lead running back Rob Kelley may be out of the lineup for a while.

Coach Jay Gruden said after Sunday's 27-20 win over the Rams that Kelley, who left the game in the first half, may have suffered a broken rib.

Kelley had 12 carries for 78 yards before leaving the game. After the game, Kelley said he suffered the injury by falling on one of his teammate's helmets, via the Washington Post.

Rookie Samaje Perine took over early-down work for the Redskins in Kelley's absence. The former Oklahoma star had 67 yards on 21 carries.

While Perine may be the popular add in fantasy leagues this week should Kelley miss any time, third-down back Chris Thompson is the guy to have right now.

Thompson, who scored last week, rushed for 77 yards and two touchdowns on three carries Sunday. He also hauled in three receptions for 29 yards.

Now 1-1, the Redskins will try to get above .500 next week against the Raiders.