The Phillies said Wednesday that Miller has a right hip flexor strain. They activated Sean Rodriguez from the injured list.
Philadelphia beat Detroit 3-2 in 15 innings in a game that ended shortly after midnight. Miller threw Nicholas Castellanos out at the plate in the 14th to keep the game tied.
Also Wednesday, Detroit put right-hander Victor Alcantara on the 10-day IL, retroactive to Sunday, with a right middle finger contusion. The Tigers recalled right-hander Jose Cisnero from Triple-A Toledo.