Dallas Keuchel went the distance in a loss to the Yankees on Thursday, giving up three runs over eight innings.
Matt Dominguez went 0-for-3 in Thursday's loss to the Yankees.
Chad Qualls (back) is believed to be unavailable for Thursday's series finale against the Yankees.
Astros pitching prospect Vince Velasquez struck out eight batters over five shutout innings for High-A Lancaster on Wednesday, scattering one hit and three walks.
Astros manager Bo Porter said reliever Chad Qualls was unavailable Wednesday with mild back discomfort.
Jose Veras earned his first save of the season, holding the Yankees scoreless in the ninth inning in the Astros' win on Wednesday.
Scott Feldman earned his seventh win of the season, limiting the Yankees to two runs over 6 2/3 innings on Wednesday.
Jake Marisnick went 0-for-5 at the plate in his return to the lineup Tuesday.
After striking out his first four times up, Chris Carter unloaded for his 30th homer of the year Tuesday, a three-run shot that gave the Astros a 7-4 win over the Yankees.
Jesse Crain (shoulder) has progressed to throwing off a mound.
Astros placed LHP Darin Downs on the 15-day disabled list, retroactive to August 15, with a right oblique strain.
Astros activated 1B Jesus Guzman from the 15-day disabled list.
Astros prospect third baseman Rio Ruiz went 2-for-4 with two doubles for High-A Lancaster on Monday.
Astros outfield prospect Domingo Santana went 3-for-4 with a home run for Triple-A Oklahoma City on Monday.
Collin McHugh earned his sixth win of the season after limiting the Red Sox to one run in six innings of work on Sunday.