Gone are Pete Alonso and Brandon Nimmo. 

In are Marcus Semien and now Jorge Polanco. 

The Mets, who also saw Edwin Díaz leave in free agency for the Dodgers, continued to reshape their roster, agreeing to a two-year, $40 million deal with Polanco, The Post confirmed. 

Polanco, 32, is coming off one of his best offensive seasons last year with the Mariners. 

Sources told The Post’s Jon Heyman that Polanco, mostly a middle infielder throughout his career with Seattle and Minnesota, would be used at a number of positions with the Mets, but would primarily serve as a first baseman and DH. 

How that fits with David Stearns’ stated desire to improve the team’s run prevention remains to be seen, as Polanco’s defense has slipped and he’s never played first base — but the Mets value his versatility, as well as his bat. 

Jorge Polanco will now call Citi Field home. Nick Turchiaro-Imagn Images

The switch-hitter bounced back from a subpar 2024 season to put up 26 homers, an OPS of .821 and a career high OPS-plus of 134 last year in 138 games. 

He also played 38 games at second base last season, but primarily served as a DH for the Mariners after appearing in 112 games at second the year prior. 

Polanco will replace at least some of the power lost by Alonso, who signed with Baltimore, and Nimmo, traded to Texas in exchange for Semien earlier in the offseason. 

Pete Alonso left for the Orioles. AP

Semien is among the best defensive second basemen in the majors, but his offense has fallen off considerably the past two years. 

Signing the veteran Polanco to a short-term deal matches much of what the Mets have done so far this offseason. 

They walked away from Alonso because they weren’t willing to go near the five years he got from Baltimore, let alone for the price tag. 

And that’s after Stearns swapped Nimmo, with five more years left on his deal at 32 years old, for Semien, 35, who has three years remaining before free agency. 

As far as this season, the Mets still have work to do. 

If they do put Polanco at first, that leaves Semien at second, Francisco Lindor at shortstop and Brett Baty at third — with Mark Vientos, Luisangel Acuña and Ronny Mauricio battling for bench spots, and Jeff McNeil still on the roster. 

Seattle Mariners’ Jorge Polanco runs on his two-RBI double against the Los Angeles Angels during the first inning of a baseball game Saturday, Sept. 13, 2025, in Seattle. AP

The addition of Polanco is another significant move in what’s been an offseason of change in Queens following the second-half collapse last year that cost the Mets a spot in the playoffs. 

With Díaz in Los Angeles, Devin Williams, signed to a three-year, $51 million deal earlier in the offseason, is set to serve as the closer after he struggled in that role with the Yankees last season. 

The Mets remain in the market for at least another outfielder, as well as help in the rotation and bullpen, since they lost sidearmer Tyler Rogers to the Blue Jays in a free-agent deal. 

Polanco’s signing was first reported by The Athletic.