Barmes (groin) will begin a rehab assignment with Double-A Altoona on Wednesday, according to the Pittsburgh Tribune-Review. Manager Clint Hurdle stopped short of saying Barmes will need to go through a spring training-length rehab stint, but the team will take things slowly with the middle infielder. Barmes is expected to also spend time playing for Triple-A Indy before making his return to the majors in late August.