Asher was optioned to Triple-A Norfolk on Thursday.
Asher pitched well in his spot start Tuesday, but following Wednesday's contest in which the bullpen was used heavily, he'll head back to the minors to give Gabriel Ynoa a chance to bolster the relief corps. Asher could find his way back up to the big leagues relatively soon thanks to his solid performance, although Chris Tillman's (shoulder) impending return from the DL could make things too crowded in the big leagues for Asher to get a fair shake.