It would not be Sale; rotation is Sale (TU), Porcello (W), ERod (TH), Fister (F), Pomernaz (SA), which puts Sale on Sunday. If they have to win, that when he goes next. I believe the plan right now if they have won the division by then ise to skip Sale's start.
Porcello would get the nod in a playoff game because its his turn. Should they lose that, ERod would get the wild-card game against the Twins. Win that and Pomeranz gets game 1 of the ALDS (If Sale has to go Sunday, Pomeranz starts game 1 anyway).