Gurley, Mason full practice participants, CB Johnson limited

ST. LOUIS -- St. Louis Rams running backs Tre Mason and Todd Gurley were full practice participants Wednesday, strengthening the position heading into Sunday's game at Washington.

Cornerback Trumaine Johnson was limited coming off a concussion in the opening victory over Seattle, but coach Jeff Fisher was optimistic he'd be ready.

Mason missed the opener and the final preseason game with a hamstring injury. The Rams anticipated he'd open this year as the starter until Gurley was ready coming off knee surgery. Gurley got more reps with the first team.

Benny Cunningham started the opener and had 45 yards rushing and 77 yards receiving.

Johnson was injured making the tackle on a short reception by Chris Matthews in the second quarter. He stayed in the game two more plays before taking a knee and informing trainers he had a concussion. He said he's feeling much better.