Asher was optioned to Triple-A Norfolk on Thursday, Eduardo Encina of The Baltimore Sun reports.
Asher was shipped to the Orioles earlier in the week after failing to make the Phillies' Opening Day squad. The 25-year-old struggled this spring, though he posted a 2.28 ERA across 27.2 innings (five starts) last year with the big-league club. He'll start out in the minors, but Asher could earn himself a shot with the Orioles at some point in 2017.