Riley was one of two players missing during Friday's practice.
Tight end Jordan Reed and nose tackle Barry Cofield both left Washington's season opener against the Houston Texans with first-half injuries.
Veteran safety has spent time healing from a hamstring strain helping free agent Cromartie-Smith adapt to the team.
The Washington Redskins have two players that seem to possess great potential in 2013 draft picks Chris Thompson and Phillip Thompson. But injuries cut both players’ rookie seasons short, and coaches haven’t gotten to see much from them in training camp either, as both are nursing injuries again.
Redskins coach Jay Gruden said that cornerback DeAngelo Hall bruised his back, and didn't suffer a more serious injury, when he landed on his back at the end of a play in one-on-one drill in the red zone Sunday morning.
The Redskins' star wide receiver heads back to the locker room early, after appearing to hurt his foot during a walkthrough.
Safety Ryan Clark left practice early after tweaking his hamstring. Meanwhile, Pierre Garcon was sidelined again after aggravating a hamstring pull from last week.
Left tackle Trent Williams returned to practice a day after receiving the day off to let a bruised shin heal up. Meanwhile, wide receiver DeSean Jackson received a day off on Saturday to allow some soreness in his legs to subside.
Redskins left tackle Trent Williams did not take part in practice on Friday, the day after getting hobbled by a kick to the shin during a play.
Wide receiver Pierre Garcon remained restricted in his activities because of a sore hamstring on Thursday.