Gant was recalled from Triple-A Gwinnett on Saturday.
Gant will come up as the replacement for Mike Foltynewicz, who hit the DL on Friday night. The right-hander has made five appearances for Atlanta in 2015, allowing 11 hits and seven earned runs over nine innings. He's found more success at the Triple-A level, where he holds a 3.14 ERA in eight appearances (seven starts, 43 innings). Gant will likely provide bullpen depth, but there's a chance he could enter the rotation as a spot starter.