The New York Mets have contemplated adding a variety of players - such as free agents Eduardo Nunez, Neil Walker, and Todd Frazier, as well as Pittsburgh Pirates utility man and trade candidate Josh Harrison - in a continued effort to upgrade at second and third base, major-league sources informed Ken Rosenthal of The Athletic.

All four players have been linked to the Mets in some capacity this offseason. For New York to acquire Harrison - who could be the next Pirates player to go following separate trades involving Gerrit Cole and Andrew McCutchen - the club would need to give up 24-year-old outfielder Brandon Nimmo, sources confirmed to Rosenthal. It should be noted that the Mets refused to part with Nimmo in trade talks for McCutchen.

Walker and Frazier are both familiar with the Big Apple as the former played with the Mets from 2016-17, hitting .273/.343/.459 (.801 OPS) in 186 games, before being traded to Milwaukee. Frazier, a New Jersey native, was acquired in a midseason deal by the Yankees from the Chicago White Sox, hitting 11 of his 28 home runs in pinstripes.

The Mets have been busy shoring up their infield, recently opting to bring back veteran Jose Reyes on a reported one-year, $2.5-million deal, and prior to that, added first baseman Adrian Gonzalez through free agency.