This could be an issue for the Bucs, who played Erik Lorig on 40% of all snaps last season. He was a key part of their running game, and was a more than adequate blocker -- although his vision was lacking, at times. The Bucs trust him to play well, though, as evidenced by the fact that he's on the roster despite missing all of the preseason and a large part of the offseason.
The Bucs tried to fill the role with Tom Crabtree in the preseason -- but he will miss the season opener with an ankle injury. Backup running backs Brian Leonard and Peyton Hillis both have experience at fullback. Of the two, Leonard is most likely to fill that role. He's more versatile than Hillis, and has generally been a better NFL fullback -- although neither has been particularly good in that role. Schiano also has experience with Leonard at fullback going back to his Rutgers days.