The first-place Houston Astros pitcher are temporarily losing pitcher Lance McCullers Jr. in the starting rotation.
McCullers has been placed on the 10-day disabled list because of lower back issues.
The move is retroactive to last Friday.
He joins staff ace Dallas Keuchel (neck) on the DL this year. Also sidelined is starter Collin McHugh, who is now on the 60-day DL.
Joe Musgrove has been activated to start Monday night's opener of a key series against the Texas Rangers at Minute Maid Park.