The Diamondbacks recalled McGough from Triple-A Reno on Monday.
McGough last appeared for the big club Aug. 10 against the Phillies, during which he pitched two scoreless innings while allowing one walk. The 34-year-old reliever has a 6.83 ERA and 1.62 WHIP across 29 major-league innings this season, but those numbers are down to a 3.22 ERA and 1.36 WHIP over 36.1 frames in Triple-A. McGough will bolster the Diamondbacks' bullpen for the upcoming road series against the Rockies.