Craig Breslow will be the new head of baseball operations for the Boston Red Sox, with the former big league reliever accepting the team's offer on Tuesday, a source told ESPN's Buster Olney, confirming a report in The Boston Globe.

Breslow was a longtime pitcher in the majors, including five seasons with the Red Sox -- the first in 2006 then a four-year run from 2012 to 2015. A lefty reliever, he was part of Boston's title-winning team in 2013.