McCreery was recalled from Triple-A Gwinnett on Tuesday.
McCreery will take the roster spot of Max Fried (groin), who was sent to the disabled list after injuring himself during Game 1 of Tuesday's doubleheader against the Nationals. The 25-year-old has only pitched one inning above the Double-A level, so he'll likely be limited to mop-up duty during his time with the major-league team.