Lee was placed on the 7-day DL at Double-A Bowie on Sunday due to a lat strain, Brittany Ghiroli of MLB.com reports.
Lee had been scratched from two straight starts due to the issue, so Bowie decided it was best to temporarily deactivate him in order to add another healthy pitcher. The 23-year-old lefty, who was added to the Orioles' 40-man roster this offseason, has a 2.98 ERA and 1.05 WHIP over 51.1 innings, but has struck out only 19 batters.