McGuire elected free agency Monday.
McGuire cleared waivers and was outrighted to Triple-A Worcester by the Red Sox on Friday, Ian Browne of MLB.com reports.
The Red Sox designated McGuire for assignment Sunday, Rob Bradford of WEEI.comreports.
McGuire will start at catcher and bat eighth in Sunday's game against the Royals, Pete Abraham of The Boston Globe reports.
McGuire will start at catcher and bat eighth in Monday's game against the Blue Jays.
McGuire is out of the lineup for Wednesday's game against the Guardians, Mac Cerullo of the Boston Herald reports.
McGuire is not in the lineup for Friday's game against the Pirates, Pete Abraham of The Boston Globe reports.
McGuire isn't in Boston's lineup for Wednesday's game against the Guardians, Christopher Smith of The Springfield Republican reports.
McGuire is out of the lineup for Sunday's game against the Angels, Chris Cotillo of The Springfield Republican reports.
McGuire isn't in the Red Sox's lineup for Friday's game against the Angels, Chris Cotillo of The Springfield Republican reports.