The Yankees selected Castro's contract from Triple-A Scranton/Wilkes-Barre on Thursday.
Castro dominated minor-league hitters in 2025, turning in a 1.53 ERA, 1.04 WHIP and 52:22 K:BB across 47 innings with Scranton/Wilkes-Barre. He'll be rewarded with a place on New York's 40-man roster as a result of his performance, and he'll have a chance to win a spot in the Yankees' bullpen during spring training.