The Red Sox optioned Westbrook to Triple-A Worcester on Wednesday, Ian Browne of MLB.com reports.
Westbrook saw regular reps at second base against left-handed pitching but did little with them, going just 2-for-22 at the plate this month. Nick Sogard was called up from Triple-A Worcester and will replace Westbrook on the 26-man active roster as the short-side platoon mate for David Hamilton at the keystone.