The Nationals released Gsellman on Wednesday, Byron Kerr of MLB.com reports.
Gsellman has spent all season at Triple-A Rochester after failing to make the Nationals' roster out of spring training. He's accumulated an 8.75 ERA and 1.78 WHIP through 36 innings in the minors and will now look to secure another deal elsewhere. The 30-year-old righty hasn't pitched in the majors since 2022, and a return to MLB is unlikely to come until he shows significant improvement.