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Castillo will be optioned to Triple-A St. Paul prior to Tuesday's game against the Rockies, Aaron Gleeman of The Athletic reports.

Castillo issued one walk and struck out one in a scoreless frame in Monday's 5-0 win, but he'll be rewarded with a demotion. He'll be sent to the minors with the Twins needing to clear a spot for Louie Varland, who is scheduled to be called up from St. Paul to start Tuesday's game.

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