Contreras (hamstring) will begin a rehab assignment with High-A Myrtle Beach on Thursday, Jesse Rogers of ESPN.com reports.
Contreras is set to begin the final stage of his rehab program after being placed on the disabled list with a hamstring strain on Aug. 11. It's unclear how many minor-league contests the catcher will appear in, but it seems that he's on track to return to the majors during this weekend's series against the Brewers.