The Orioles placed Selby on the 60-day injured list Saturday due to right shoulder inflammation, Rich Dubroff of BaltimoreBaseball.com reports.
Selby's move to the 60-day IL will ensure he remains sidelined until at least late May and opens up a spot on the 40-man roster for Jackson Kowar, who was acquired in a trade with the Twins on Saturday. Selby isn't reportedly dealing with any structural damage, which increases the likelihood that he could return to the Orioles' bullpen after a minimum-length IL stint.