This would be an upgrade.

A source told The Post’s Mike Puma that the Mets have spoken to the Marlins about catcher J.T. Realmuto. It would take a significant haul from the Mets to land Realmuto from the rebuilding Marlins. The 27-year-old has yet to play this season due to a back contusion, but is expected to return to Miami’s lineup next week.

The Mets lost Travis d’Arnaud to a partially torn UCL that will require Tommy John surgery and keep him out for the rest of the season. Kevin Plawecki suffered a hairline fracture in his hand and the Mets expect him to be out 3-4 weeks.

The Mets have called up rookie Tomas Nido and veteran Jose Lobaton is expected to join the team soon. But neither may be seen as the answer in the absence of Plawecki, who was originally slated to platoon with d’Arnaud this season.

Realmuto hit .278 with 17 home runs and 65 RBIs last season.