With Alan Embree on his way here, the Red Sox needed room on the 40-man roster. They have designated infielder Kevin Frandsen for assignment. Frandsen was hitting .258 with two homers and four RBI for Pawtucket.
Frandsen was acquired from the Giants in spring training when the Sox became concerned about their depth at shortstop.
LHP Fabio Castro was optioned back to Pawtucket to make room on the 25-man roster.