A slimmed-down Rob Kelley is likely to remain Washington’s top running back even though Adrian Peterson is joining the Redskins.

Amid four injuries in their backfield, the Redskins signed the 33-year-old four-time All-Pro running back on Monday. But Kelley, the former “Fat Rob” who lost weight and added speed to his repertoire, should still be considered the front-runner to start Week 1 at the Arizona Cardinals.

Washington lost second-round pick Derrius Guice to a season-ending torn ACL, won’t have Samaje Perine and Byron Marshall for an extended period of time because of lower-leg injuries and waived undrafted free agent Martez Carter with an injury designation. That necessitated signing Peterson —a former standout at Oklahoma who played the majority of his career with the Vikings — and fellow running back De’Veon Smith, though coach Jay Gruden gave Kelley a vote of confidence on Sunday.

“We’re not looking for a starter right now,” Gruden said. “We’ve got Rob in-house, obviously Chris Thompson, Kapri Bibbs has done a good job, Samaje I don’t think is going to be very long at all. So we’ve got four backs right there.”