Seabold was optioned to Triple-A Worcester on Wednesday, Pete Abraham of The Boston Globe reports.
EDGE Analysis
Seabold will shift to minor-league camp after opening spring training with the big club. The right-hander made his MLB debut last season with a three-inning appearance but spent most of the year with Worcester, where he had a 3.50 ERA, 1.15 WHIP and 52:19 K:BB over 54 frames.