Montero is not on the Tigers' roster for the American League Wild Card Series against the Astros, Evan Woodbery of MLive.com reports.
The Tigers' starting pitching plans beyond Tarik Skubal in Game 1 are cloudy, but Montero didn't make the cut despite a 3.79 ERA over 10 starts and two relief appearances from August on. He could potentially be added to the ALDS roster, if the Tigers advance.