Cowser was diagnosed with a left hand fracture after Wednesday's loss to the Royals, Roch Kubatko of MASNSports.com reports.
The Orioles' loss Wednesday eliminated them from the postseason, so Cowser will have plenty of time to recover before the start of spring training in February. The 24-year-old slashed .242/.321/.447 with 24 homers and 69 RBI across 153 games in the regular season and figures to remain in Baltimore's outfield plans for 2025.