The White Sox reassigned Dunning to minor-league camp Friday.
Dunning received a non-roster invite to spring training and allowed seven earned runs over nine innings with four strikeouts this spring. The 23-year-old earned the invite with stellar 2017 season between Low-A Kannapolis and High-A Winston Salem, delivering a 2.94 ERA and 168:38 K:BB over 144 innings (26 starts), and is likely to start the 2018 season at Double-A Birmingham.