Stiever has yet to pitch in the Cactus League due to soreness in his forearm, Scott Merkin of MLB.com reports.
Stiever said he was bothered by soreness "in a weird spot in my arm," but an MRI showed it was normal. White Sox general manager Rick Hahn described the injury as a muscle strain in the forearm, something the team discovered following a side session. As such, he was shut down for two-to-three weeks and is currently halfway through the break. The White Sox reassigned him to minor-league camp to continue his rehab. The 22-year-old is the team's sixth-ranked prospect per RotoWire (fifth-ranked by MLB Pipeline) and will be behind other starters to begin the season.