The Cubs, facing the possible loss of closer Kerry Wood, have acquired right-hander Kevin Gregg from the Marlins, according to major-league sources.
Gregg, 30, closed for the Marlins for most of last season, but the Cubs likely would use him as a bridge to a Carlos Marmol if Wood departed as a free agent.
Marmol would take over as the closer, with the Cubs likely using a number of relievers — including Gregg, Jeff Samardzija, Angel Guzman, Neal Cotts, and Kevin Hart — leading up to the ninth inning.
It is not yet known whom the Marlins will receive in return for Gregg.
The Marlins have now traded four arbitration-eligible players since the end of last season — Gregg, first baseman Mike Jacobs, left-hander Scott Olsen and outfielder Josh Willingham.
Gregg tied with the Rockies' Manuel Corpas for the major-league lead in blown saves last season, finishing 29-for-38 in save opportunities with a 3.41 ERA.