The Orioles reassigned Diplan to minor-league camp March 27, Roch Kubatko of MASNSports.com reports.
Diplan will open the season at Triple-A Norfolk, likely as a member of the bullpen. He reached the majors for the first time in 2021, making 23 appearances for Baltimore and submitting a 4.50 ERA and 1.23 WHIP across 30 innings.