The Astros optioned Ullola to Triple-A Sugar Land on Thursday.
Ullola couldn't have fared much better in his first two big-league appearances this week, logging four scoreless frames with a 7:0 K:BB and only two hits allowed. He should get another opportunity sooner rather than later, but for now Ullola's roster spot will be taken by Cristian Javier (shoulder), who is due back from the injured list Friday.