The Astros claimed Junk off waivers from the Brewers on Friday and optioned him to Triple-A Sugar Land, Matt Kawahara of the Houston Chronicle reports.
Junk has allowed six runs in eight innings in the majors this season but holds a 2.55 ERA and 35:15 K:BB across 35.1 frames at the Triple-A level. He's been pitching in relief exclusively since May, but Junk does have extensive starting pitcher experience and it's not clear what role the Astros have planned for him.