Mayers' contract was selected by the Angels on Saturday.
Mayers has made 15 relief appearances for the Angels this season, struggling to a 5.40 ERA. He worked as a starter while pitching for Triple-A Salt Lake but struggled to a 6.27 ERA in eight starts, so that experiment may be over. The Angels could lean on Mayers to provide length behind starting pitcher Jaime Barria in Game 1 of Saturday's doubleheader in Seattle, however, as Barria will be pitching on only two days' rest.