Per a report from Wexell on twitter. If torn, Clay would go on IR.

That would give you Redman, Rainey, Batch and Dwyer just by default until Mendenhall returns from the PUP list. I though those 4 would end up being the RBs to make the final cut, but I wonder if the Steelers will bring in somebody else to push those guys, provide a body in camp, and maybe compete for a roster spot.