The White Sox optioned Bush to Triple-A Charlotte on Monday.
Bush managed one nice start against the Astros, but his other three outings during his first stint in the big leagues were woeful, as the lefty ultimately collected a 5.60 ERA and 11:16 K:BB over 17.2 frames across the four starts. The left-hander will work on ironing out his issues at Charlotte and the White Sox will now need a starter for three week's series against the Rangers to take Bush's spot.