Running back Alfred Morris (46) bolts through the Indianapolis Colts defense Saturday. (Jonathan Newton/WASHINGTON POST)

Fellow running back Roy Helu Jr., who missed the last two preseason games with tendinitis in his Achilles’ tendons, said he too felt like he was making progress. He went through portions of practice Monday afternoon and said he wants to play Wednesday, the final opportunity for players to prove themselves to coaches before Friday’s final cutdown.

The Redskins and other NFL teams trimmed their rosters from 90 to 75 players on Monday, and must get down to 53 players by 9 p.m. Friday.

Royster started the preseason opener at Buffalo, and continued to receive the bulk of the first-team carries until he injured his knee last week. Royster said he woke up Wednesday morning with soreness in his right knee. He didn’t remember hurting it in practice, but figured maybe he tweaked it while making a cut.

Helu came off the bench in the preseason opener, but hasn’t played since.

With them sidelined, rookie Alfred Morris started Saturday and carried the ball 14 times for 107 yards and a touchdown. In the same game, Tim Hightower – who has worked his way back from a torn ACL suffered last October – gained 28 yards on five carries.

The Redskins have yet to name their starting running back.