The Bruins have sent an email offering the negotiating rights to Tomas Kaberle to other teams, according to TSN's Darren Dreger.
Kaberle came over in a trade this February in exchange for Joe Colborne, a 2011 first round pick, and a 2012 second round pick whose condition became fulfilled when the Bruins won the Cup. He becomes an unrestricted free agent on Friday.
He played 24 regular season games for Boston, scoring one goal with eight assists. In 25 playoff games, he had no goals and 11 assists.