Alzolay will make his 2018 debut for Triple-A Iowa on Thursday, Carrie Muskat of MLB.com reports.
Alzolay was optioned to Double-A Tennessee in early March but has since been building his arm strength to a starter's workload in extended spring training. The 23-year-old only logged 32.2 innings at the Double-A level. The right-hander could see the major-league roster in 2018 if he showcases himself well at Triple-A, but that seems unlikely until later this summer.