Boston optioned Gasper to Triple-A Worcester on Sunday, per Jen McCaffrey of The Athletic.
With both Trevor Story (abdomen) and Roman Anthony (finger) being reinstated from their long-term IL stints, Gasper was forced off the active roster. Despite being sent down, the 30-year-old had been raking as over his last seven games, slashing .538/.714/1.231 with two homers and four RBI in 20 plate appearances.