Martin (concussion) has been ruled out for Sunday's game in Green Bay, Tom Silverstein of the Milwaukee Journal Sentinel reports.
Martin was unable to practice at all this week, which puts him in danger of missing time beyond Sunday. His absence leaves Jacquizz Rodgers as the likely starting running back, but there's no guarantee the role leads to a large workload, given that Peyton Barber and Charles Sims also should see involvement in the Bucs' game plan.