The move is retroactive to Friday. Contreras has five saves.
General manager Ruben Amaro Jr. says the 39-year-old Contreras will return to Philadelphia on Monday to be seen by a team doctor. Amaro says Contreras has a strained flexor pronator in his right elbow.
Ryan Madson will move into the closer's role. To take Contreras' spot on the roster, the Phillies will purchase the contract of Michael Stutes from Lehigh Valley.