The Astros optioned Ullola to Triple-A Sugar Land on Wednesday.
Ullola gave up three earned runs in just one inning after getting called up Sunday, and he'll now lose his spot in the Astros' bullpen in order to make room for Hayden Wesneski's (elbow) return from the IL. Ullola owns a 4.92 ERA and 1.40 WHIP through 53 innings at Sugar Land and could make a few more appearances for Houston down the stretch as a replacement for a tired arm.