Warren (hamstring) was listed as a full participant in Thursday's practice, Teresa Varley of the Steelers' official site reports.
Warren has been rehabbing a hamstring issue since being injured in an Aug. 17 preseason game, including being limited in Wednesday's practice, but it looks like he's fully ready for Week 1. The third-year pro doesn't look like he'll carry an injury designation into Sunday's road matchup against the Falcons, so it appears as though fantasy managers can be confident in Warren handling a key role out of the Pittsburgh backfield alongside Najee Harris.