Sheffield was optioned to Triple-A Tacoma on Monday, Shannon Drayer of 710 ESPN Seattle reports.
Sheffield impressed with the big-league club in camp, and he'll head to the minors after striking out six batters over four scoreless innings. The former first-round pick appeared with the Yankees in four games during the 2018 campaign, giving up three runs on four hits and three walks over 2.2 innings.
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