Greene (elbow) was activated from the 15-day injured list ahead of his scheduled start Sunday against the Pirates.
The first-time All-Star will return for his first start since Aug. 13, having completed a 52-pitch simulated game Tuesday. Greene will likely be on a short leash in his final two starts of the season, as the Reds prioritize keeping him healthy heading into the winter. Alan Busenitz was designated for assignment in a corresponding move.