Diaz (oblique) could rejoin the Astros during the team's series versus Detroit that begins Monday, Brian McTaggart of MLB.com reports.
Diaz has been sidelined since early May due to a left oblique strain. He began a minor-league rehab assignment June 9 and has gone 2-for-11 with a walk through three games with Triple-A Sugar Land. Diaz figures to reclaim his role as Houston's No. 1 catcher upon his return.