McLain (calf) rejoined the Reds after spending the All-Star break at the team's training complex in Arizona, MLB.com reports.
McLain has been hitting in a cage and took groundballs Thursday during a team workout at Coors Field ahead of a three-game set against the Rockies. He was placed on the 10-day injured list July 10, retroactive to July 8, and is eligible to return Saturday.