The San Francisco Giants were involved in the most shocking offseason turn of events this week when they held up their deal with star shortstop Carlos Correa over a medical concern, opening the door for him to sign with the New York Mets.

On Thursday, ESPN’s Jeff Passan shed light on the thought process behind San Francisco’s hesitation, revealing the team had concerns over Correa’s lower right leg following his physical examination. The 28-year-old had broken his fibula in 2014 on a slide during a minor league game, which led to surgery.

Passan noted that the Giants’ fear “concerned the long-term stability of his leg—and the potential for Correa to quickly lose the mobility that won him a Platinum Glove in 2021.”