Dallas Keuchel will be pushed back from his scheduled Friday start due to fatigue.
Mike Fiers yielded three runs -- one earned -- over five innings Wednesday in a no-decision versus the A's.
Marwin Gonzalez left Wednesday's game against the A's due to right hamstring discomfort.
Yulieski Gurriel will start in left field for the Astros on Wednesday against the A's.
Collin McHugh spun six scoreless innings as the Astros defeated the A's 3-1 on Tuesday.
Colby Rasmus homered in his first game off the disabled list Tuesday against the Athletics.
Ken Giles struck out two Athletics over a scoreless inning of work Tuesday to earn his sixth save.
Evan Gattis hit his 22nd home run of the year in Tuesday's win over the A's.
Yulieski Gurriel is out of the Astros' starting lineup on Tuesday against the Athletics.
Astros optioned RHP Brad Peacock to Triple-A Fresno.
Astros activated OF Colby Rasmus from the 15-day disabled list.
Colby Rasmus (ear) will be activated from the disabled list on Tuesday.
Joe Musgrove allowed three hits over 5 1/3 innings Monday in the Astros' 6-0 shutout of the Athletics.
Jose Altuve hit his 22nd homer of the year Monday against the Athletics.
Lance McCullers (elbow) played catch from a distance of 60-90 feet.