The Angels recalled Wantz from Triple-A Salt Lake on Wednesday.
Anaheim swapped Wantz into its bullpen for Kenny Rosenberg, who was optioned to Triple-A since he wasn't going to be available for at least the next four days after covering five innings and tossing 99 pitches in long relief during Tuesday's loss to the Yankees. Like Rosenberg before him, Wantz is expected to handle lower-leverage work out of the bullpen.