Diaz (hand) went 0-for-2 with two walks in a rehab game at Double-A Corpus Christi on Tuesday.
The Astros moved Diaz's rehab from the Gulf Coast League to Double-A Corpus Christi, for which he served as the designated hitter Tuesday. The Astros will want the utility infielder to play in the field, probably on back-to-back days, before reinstating him to the active roster.