Martin (hamstring) has an MRI scheduled for Tuesday, NFL.com reports.
Martin was previously reported to be slated for further evaluation Monday, but more official testing will take place Tuesday, after which the specifics of his hamstring ailment should be clarified. If Martin is forced to miss any time, Charles Sims would figure to become the Buccaneers' lead tailback, with recent signing Jacquizz Rodgers in line for snaps behind him.