Don’t think anyone at USC was prepared for John David Booty to come back Tuesday and throw the ball as well as he did, including Booty himself.

As to how that influences Saturday’s starter at Notre Dame, neither Booty, the USC coaches or backup Mark Sanchez, the starter Saturday against Arizona, seemed to know yet what it meant.

But if there’s not much swelling or pain the rest of the week, this will be a lot more difficult a call than at first it looked to be.

Stay tuned.