The Red Sox are moving towards a trade with the Pirates for Joel Hanrahan, according to multiple sources.

One official cautioned that there was "still work to be done" on the deal.

Hanrahan saved a total of 76 games over the last two seasons for the Pirates and is a year away from free agency.

It is unclear what the Pirates would be getting back in return.

One major league source said Pittsburgh is seeking a "significant return" for Hanrahan.