Martin (hamstring) has been ruled out for Sunday's game in San Francisco.
Martin was seemingly on track to practice for the first time since he injured his hamstring in Week 2, but he then suffered a setback at some point last week, leaving him without a clear timetable to return. With Charles Sims (knee) also out of the picture, Jacquizz Rodgers is set to handle a heavy three-down workload in Sunday's favorable matchup against the leaky San Francisco run defense. Peyton Barber and Antone Smith will provide depth.