The New York Mets reportedly harbour concerns regarding Carlos Correa's physical, potentially throwing their 12-year, $315million agreement with the star shortstop into doubt.

Earlier this week, free agent Correa appeared set to join the San Francisco Giants after reportedly agreeing a 13-year, $350m contract with the franchise.

The Giants were set to make their agreement with the two-time MLB All-Star public on Tuesday, only for the news conference to be postponed amid reports of a medical issue arising during Correa's physical.

That delay allowed the Mets to swoop for Correa, with team owner Steve Cohen subsequently telling The New York Post a deal was close to being finalised.

"We need one more thing, and this is it," Cohen said. "This was important. This puts us over the top."

Rise and shine!

Carlos Correa, Mets reportedly agree to 12-year deal, per @MLBNetwork Insider @JonHeyman. pic.twitter.com/oPB28VahZG

— MLB (@MLB) December 21, 2022

However, Correa could now see a second move collapse in quick succession after a report from The Athletic claimed the Mets are concerned about his surgically repaired lower right leg.

He underwent arthroscopic surgery to repair a fractured right fibula and minor ligament damage at the age of 19 in 2014.

The report said the Mets have reservations about Correa's long-term fitness, while acknowledging Cohen's public statements on the progress of the deal could make it difficult for them to withdraw entirely.

The New York Post's baseball columnist Jon Heyman said both parties were trying to "work it through".

Correa has made seven trips to the injured list since 2015, with a torn ligament in his thumb, lower back soreness and a fractured rib.

If the Mets were to perform a remarkable U-turn on their decision to pursue Correa, it would represent a severe blow for a player who has only played at least 150 games in a season once in his eight-year career.