Diamondbacks activated RHP Zac Gallen from the 15-day injured list.

Gallen will start against the Royals on Wednesday after missing two months with elbow inflammation. He pitched 1 2/3 scoreless innings in his one rehab start with Triple-A Reno. He’s 3-9 with a 6.34 ERA in 19 starts for the Diamondbacks this season.