The White Sox recalled Schultz from Triple-A Charlotte on Tuesday.
The left-hander was sent down in early August after making 15 appearances (14 starts) and posting a 6.06 ERA, 1.42 WHIP and 59:31 K:BB across 65.1 innings. Schultz pitched well after being optioned to Charlotte, giving up just four earned runs across 21.2 frames in five outings after the demotion. The 23-year-old should serve as a long-relief option out of the bullpen now that he's back in the majors.