The Marlins plan to sign veteran third baseman Placido Polanco to a one-year, $2.75 million if he passes medical tests, an industry source said.
Polanco, who has been bothered by back problems in the past year, was among the most accomplished free agent third basemen remaining in a group of players largely past their prime.
Polanco, 37, hit .257 with two homers and 19 RBI in 90 games for the Phillies last season. He hit .277 with five homers and 50 RBI in 2011 and .298 with six and 52 in 2010.
He has won three Gold Gloves, the most recent in 2011. He was voted a starter in the All-Star Game in 2007 and 2011.
Overall, Polanco has hit .299 in 15 seasons with St. Louis, Detroit and Philadelphia.
Other free agent third basemen who were still available, and drew Marlins consideration, include Brandon Inge, Miguel Tejada, Matt Downs and Ryan Raburn.
Former big league third baseman Kevin Kouzmanoff and ace pinch-hitter Greg Dobbs also will be in the camp for the Marlins, who prefer to use Dobbs as a fill-in and pinch hitter.
Polanco's signing would firm up the Marlins' lineup, unless there are any more trades.
Miami likely will go with Logan Morrison at first base, Donovan Solano at second, Adeiny Hechavarria at shortstop, Polanco at third, Juan Pierre in left, Justin Ruggiano in center, Giancarlo Stanton in right and Jeff Brantly catching.