Kopech tested his injured hamstring by throwing off a mound Tuesday, Daryl Van Schouwen of the Chicago Sun-Times reports.
Kopech hasn't pitched since May 26 due to a strain and awaits the next course of action. Manager Tony La Russa said the coaches will huddle with medical staff to determine the next steps, namely, whether Kopech can get enough work in bullpen sessions and simulated games with the team or if a minor-league rehab stint is necessary.