The Nationals acquired Glassey from the Orioles on Monday in exchange for outfielder Christian Franklin, Andy Kostka of TheBanner.com reports.
Glassey, 25, has been old for his levels this season, but the righty reliever has a 2.64 ERA, 1.11 WHIP and 53:8 K:BB in 30.2 innings between High-A and Double-A. He has only logged 2.1 innings at Double-A, but given his age, he could reach Triple-A before the end of 2026.