LANDOVER, Md.

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.

On the first day of camp, Gruden was only sure of one thing: that third-down back Chris Thompson would be on the roster and figure prominently in his return from a broken fibula. Kelley, a 2016 undrafted free agent who emerged as Washington’s No. 1 running back during his rookie year and started 2017 on top of the depth chart, cut his hair short, added more muscle and looks quicker to Gruden at a svelte 222 pounds.

Rams

THOUSAND OAKS, Calif. (AP) — The Los Angeles Rams continue to finalize contract extensions for players other than standout defensive tackle Aaron Donald, as right tackle Rob Havenstein on Monday agreed to terms of a fouryear deal through the 2022 season worth $32.5 million.

Coach Sean McVay said Havenstein, who has started 43 games over the past three seasons since being drafted in the second round in 2015, had earned the new contract by “becoming one of the more consistent right tackles in this league.”

Packers

GREEN BAY, Wis. (AP) — Injuries and unexpected developments have left the Green Bay Packers thin at running back with just two camp practices and two games left in the preseason.

Only Ty Montgomery, who has overcome injury issues in the past, and little-known halfback Joel Bouagnon have made it through camp unscathed.

The Packers were forced to sign Bronson Hill and LeShun Daniels over the weekend to replenish depth.

Hill spent two games on Arizona’s 53-man roster after bouncing around a host of practice squads. Daniels played four games for Washington last season.

“We’re a little thin at running back,” coach Mike McCarthy said Monday. “We’ve got a number of different balls in the air, (more) than I recall at this particular juncture of a training camp.”

Bills

ORCHARD PARK, N.Y. (AP) — Rookie quarterback Josh Allen moved one step closer to becoming the Buffalo Bills’ starter.

Coach Sean McDermott is providing the strong-armed, first-round draft pick his opportunity to win the job by naming him the starter in Buffalo’s preseason game against the Cincinnati Bengals on Sunday.

The team announced the decision on its Twitter account Monday evening after Allen practiced with the first-string offense earlier in the day.

The Bills provided no other details regarding the decision, and McDermott isn’t scheduled to address reporters until Friday. Allen and offensive coordinator Brian Daboll are currently scheduled to speak to the media when the team returns to practice Wednesday.

Raiders

ALAMEDA, Calif. (AP) — After spending his first 10 NFL seasons in Green Bay with the same quarterback and head coach, Jordy Nelson acknowledged it took a little time to adjust to his new environment with the Oakland Raiders.

Nelson got over that fairly quickly and has done his best to fit in and adjust right away, becoming a leader in the receiver room and a trusted target for quarterback Derek Carr.

Nelson gets the chance to reunite with Aaron Rodgers, coach Mike McCarthy and the rest of his former Packers teammates when Green Bay visits the Raiders on Friday night in an exhibition game.