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Riley (concussion) wasn't participating in Monday's practice, Pat Leonard of the New York Daily News reports.
According to Leonard, it's unclear when Riley sustained his concussion and how much time he's expected to miss. The 26-year-old appeared in 13 regular-season games for the Steelers last season, recording 12 total tackles on 214 special-teams snaps. Expect Riley to compete for another special-teams role once he moves past his concussion.
