Winckowski was optioned to Triple-A Worcester on Wednesday, Pete Abraham of The Boston Globe reports.
Winckowski was added to Boston's 40-man roster in November and will now head to minor-league camp after opening spring training with the major-league club. He appeared in two games for Worcester but spent most of 2021 at the Double-A level, where he posted a 4.23 ERA, 1.30 WHIP and 88:30 K:BB across 100 innings.