Breen inked a one-year, AHL-only contract with the Bruins on Monday.
Breen, 30, has spent the last five seasons with AHL Providence, the last four as an alternate captain. The 6-foot-7, 226-pound defenseman appeared in 47 minor league games this past season, tallying two goals and nine helpers for 11 points to go along with a plus-eight rating. Signed to an AHL contract, Breen is still a free agent, in that he still can be signed to an NHL contract by any of the other 31 clubs.
Breen was placed on waivers by Boston on Sunday, Bob McKenzie of TSN reports.
The Bruins acquired defenseman Nick Holden in a trade with the Rangers on Tuesday, which -- in addition to the B's being in playoff position -- squashed Breen's chances of playing for the big club this season. He's not someone that you need to be concerned with in fantasy.