Musgrove was promoted from Triple-A Fresno on Monday, Jake Kaplan of the Houston Chronicle reports.
The Astros sent Scott Feldman to Toronto on Monday, so Musgrove will come up to fill the vacancy on the 25-man roster. The right-hander, who's never pitched in a major league game, has split the season between Double and Triple-A. In 10 starts for Fresno, Musgrove holds a 3.81 ERA and 1.14 WHIP.