The Red Sox optioned Harris to Triple-A Worcester on Saturday.
Harris will lose his place on the active roster to make room for Eduardo Rivera, who is expected to start Saturday's game against the Mets. Harris went 0-for-2 with a hit-by-pitch during his lone appearance after getting called up to Boston on Thursday and has gone just 3-for-18 at Worcester since joining the organization June 30. He will likely spend most of what's left of the year in the minors.