White Sox pitching coach Don Cooper concerned about Michael Kopech

White Sox: Prospect Profiles - The Versatile Dane Dunning

White Sox pitching coach Don Cooper concerned about Michael Kopech - Chicago Sun-Times

White Sox pitching coach Don Cooper says he is concerned about Michael Kopech, who recently opted out of the upcoming 2020 season: I don't know what is going on with Michael, but

Cooper on Kopech's debut, 08/20/2018

If you need Don Cooper, he's working. Just don't ask about his 'legacy' - The Athletic

Sources: Meeting between Michael Kopech, White Sox laid out his 2020 concerns - The Athletic

Chicago Tribune

Liam Hendriks joins young White Sox bullpen

Manny Banuelos injury against Indians