Jansen (back) is available out of the Red Sox' bullpen for Thursday's game versus the Blue Jays, Gabrielle Starr of the Boston Herald reports.
Jansen hasn't pitched since Saturday due to back tightness, but he made it through a bullpen session Wednesday with no issues and is ready to roll. The veteran closer has six saves, a 1.04 ERA and a 12:2 K:BB through nine outings this season.