Asher was recalled from Double-A Reading and will start Thursday against the Nationals.
The Phillies had announced that Asher would join the big club, so Thursday's move comes as no surprise. He's started four games at Triple-A Lehigh Valley this season, where he put up a 1.53 ERA and a 0.61 WHIP. However, he hasn't had much luck during his career in the majors. Across seven starts, he's given up 30 runs over 29 innings, giving him an ERA of 9.31.