Neil Walker was traded from the Mets for a chance to play meaningful games over the final two months of last season, but now team officials are wondering if he might consider a reunion.

The free-agent infielder remains high on the Mets’ list of possibilities to fill their opening at second base, according to industry sources, but in this case, familiarity may hurt the club more than benefit it.

At issue is the failed contract-extension negotiations between Walker and the team from earlier this year, causing bruised feelings that could leave the player and his representatives hesitant to embrace the possibility of a return.

The Mets are exploring various options at second base — trades among them, with names such as Jason Kipnis, Ian Kinsler and Dee Gordon available — but signing a free agent would allow the team to preserve trade chips that might be needed to address other areas.

Walker, 32, accepted a qualifying offer from the Mets worth $17.2 million before last season, and the two sides worked toward an extension before negotiations broke down early in spring training and never regained serious momentum.

In August, with the Mets’ season in shambles, Walker was traded to the Brewers for a player to be named later who became minor league reliever Eric Hanhold.

Walker posted a .267/.409/.433 slash line last season with 14 homers and 49 RBIs in 111 games. For a second straight season, Walker spent significant time sidelined by injury, missing five weeks with a partially torn left hamstring. In 2016, his season ended a month early because of a herniated disk in his back that required surgery.

In addition to Walker’s offensive capabilities, team officials are high on Walker for the leadership and professionalism he brought to the Mets clubhouse after arriving in a trade with the Pirates before the 2016 season.

Asdrubal Cabrera, whose $8.5 million option for next season was exercised, likely will become the starting third baseman. But team officials haven’t ruled out the possibility of acquiring a third baseman and shifting Cabrera to second.

The puzzle also could be affected by whether the Mets are successful in landing a high-end bat who would factor into the first-base equation. If the Mets were to spend big on Carlos Santana or Jay Bruce, it could leave the team less inclined to lavish significant dollars on a second baseman.

Among the options for a smaller splash at the position would be Jose Reyes, who remains a possibility for a return.