Jerez was outrighted to Triple-A Pawtucket on Friday, Jason Mastrodonato of the Boston Herald reports.
Jerez was sent off the 40-man roster last week to make room for Mitch Moreland, and he'll now head to the Triple-A affiliate. The lefty has yet to appear above Double-A in his career, as he posted a 4.71 ERA with 65 strikeouts in 65 innings working out of the bullpen at that level last season.