Tyler Mahle (7-3, 3.68) will start the series opener at 7:10 p.m. Friday. Luis Castillo (3-10, 4.65) will start the second game at 7:10 p.m. Saturday.
Gray was placed on the injured list July 7 and said at the time he hoped extended rest over the All-Star break would help him return without missing more than one start.
The Reds also placed reliever Art Warren (left oblique strain) on the 10-day injured list Thursday. Warren is 2-0 with a 1.88 ERA in 18 games. He last pitched Sunday in a 3-1 victory against the Brewers, throwing a scoreless third of an inning.
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