The Red Sox designated Coulombe for assignment following Saturday's 4-0 win over the Mets, Chris Cotillo of MassLive.com reports.
Coulombe finished Saturday's game for the Red Sox, when he issued three walks but did not allow a hit across two scoreless frames. He has a 4.50 ERA and 1.50 WHIP across 22 innings this season, and if he clears waivers, Coulombe should garner interest from teams looking to add a southpaw to the bullpen.