If one-win Oregon State is to pull off a Week 6 upset, they may have to do so without their bell cow in the running game.

In last Saturday’s blowout loss to Washington State, Ryan Nall went down with what was later diagnosed as a sprained ankle. With a road trip to 14th-ranked USC on the horizon, Nail was a non-participant in the last practice prior to leaving for the Coliseum.

When asked about the running back’s availability for Saturday afternoon’s game, Gary Andersen was noncommittal.