McHugh (elbow) was transferred to the 60-day disabled list Thursday, Brian McTaggart of MLB.com reports.
Despite throwing off a mound at the end of May, McHugh still remains without a timetable for return. This made him an easy choice to be moved from the 40-man roster to allow top prospect Francis Martes to head to Houston for his big-league debut. It's unlikely that McHugh will be able to make an impact with the Astros until the second half of the season, although more information on his recovery progress should come forth once he ramps up his throwing program.