De Leon (elbow) elected free agency Monday, Do-Hyoung Park of MLB.com reports.

The Twins sent De Leon (elbow) outright to Triple-A St. Paul on Friday.

De Leon (elbow) underwent successful season-ending Tommy John surgery Wednesday along with additional procedures on his arm, Do-Hyoung Park of MLB.com reports.

De Leon is set to undergo season-ending Tommy John surgery after he underwent an MRI on Monday that revealed a torn ligament in his right elbow, Bobby Nightengale of the Minneapolis Star Tribune reports.

De Leon was placed on the 15-day injured list Sunday, Dan Hayes of The Athletic reports.

The Twins selected De Leon's contract from Triple-A St. Paul on Tuesday, Do-Hyoung Park of MLB.com reports.

De Leon was reassigned to minor-league camp by the Twins on Saturday, Dan Hayes of The Athletic reports.

De Leon signed a minor-league contract with the Twins on Tuesday, which includes an invitation to spring training, the pitcher announced.

Triple-A Buffalo reinstated De Leon (shoulder) from its 7-day injured list Sunday.

De Leon (shoulder) made the second appearance of his rehab assignment Saturday with Single-A Dunedin, striking out two and allowing one run over one inning.