The Astros recalled Blanco from Triple-A Sugar Land to start Tuesday's game against the White Sox, Brian McTaggart of MLB.com reports.
The right-hander is back in the majors Tuesday with rosters expanding to 28 players and will immediately step into Houston's rotation. Blanco has struggled to a 7.71 ERA, 1.46 WHIP and 20:12 K:BB in 23.1 frames over his five appearances in the big leagues this season.