Mason (foot) was a limited participant in practice Wednesday, Nick Wagoner of ESPN.com reports.

EDGE Analysis

Mason emerged from the 49ers' preseason finale with a sprained foot, but his return to drills Wednesday indicates that he's making progress in his recovery effort. The 49ers backfield is paced by the do-it-all Christian McCaffrey, whose direct backup, Elijah Mitchell, will also get touches on game days as long as he's healthy. As a result, if Mason isn't ready for Sunday's game in Pittsburgh, Tyrion Davis-Price may be the team's third active running back in that contest.