Alexander played catch Friday for the first time since sustaining a fractured left hand before the All-Star break, Andy Kostka of TheBanner.com reports.
The Astros recalled Meyers from Triple-A Sugar Land on Friday, Chandler Rome of The Athletic reports.
Povich is slated to start Sunday's game against the Rangers at Globe Life Field.
Young (8-3) took the loss against the Angels on Thursday, allowing three runs on six hits and two walks in 4.1 innings. He struck out four.
The Astros optioned Dezenzo to Triple-A Sugar Land on Thursday, Matt Kawahara of the Houston Chronicle reports.
Narvaez is absent from the lineup for Thursday's contest against the Angels.
Mayo is not in the lineup for Thursday's game versus the Angels.
Altuve went 2-for-5 with a solo home run in Wednesday's 5-4 extra-inning loss to the Blue Jays.
O'Neill went 1-for-3 with a two-run home run in Wednesday's 5-2 win over the Angels.
Mayo went 2-for-4 with a solo home run in a 5-2 win against the Angels on Wednesday.
