The Red Sox will designate Marlon Byrd for assignment tomorrow, reports MLB.com's Ian Browne (on Twitter). The move will clear a roster spot for Daisuke Matsuzaka, who will be coming off the disabled list to start on Saturday.
Byrd, 34, was acquired from the Cubs for Michael Bowden and Hunter Cervenka following Jacoby Ellsbury's shoulder injury back in April. He hit just .273/.288/.333 in 105 plate appearances for Boston. Chicago is paying all but $400K of Byrd's $6.5MM this season, so the move doesn't hurt the Red Sox's bottom line. Bowden was designated for assignment by the Cubs about a week ago.