The Angels optioned Rosenberg to Triple-A Salt Lake on Thursday.
Rosenberg was returned to Triple-A one day after he was called up and appointed as the Angels' 27th man for a doubleheader with the Reds. He covered two innings out of the bullpen in the Angels' 9-4 loss in the first game of the twin bill, giving up one earned run on two hits and two walks while striking out three.