The Astros optioned Blanco to Triple-A Sugar Land on Sunday, Julia Morales of AT&T SportsNet Southwest reports.
Since Blanco wasn't scheduled to make another start during the final week before the All-Star break, the Astros opted to swap him off the 26-man active roster in favor of a fresh bullpen arm in Parker Mushinski, who was recalled from Sugar Land in a corresponding move. While serving as a starter in each of his last five appearances for Houston, Blanco went 2-0 with a 4.82 ERA, 1.36 WHIP and 23:15 K:BB across 28 innings. Unless Jose Urquidy (shoulder) is ready to return from the 60-day injured list coming out of the All-Star break, Blanco will likely rejoin the Astros once the team requires a fifth starter for the first time in the second half.