Contract Extension with FC Nantes
In June 2023, Jean-Charles Castelletto extended his contract with FC Nantes, securing his place with the club for the coming seasons. This extension was seen as an endorsement of his skills and contributions to the team. Castelletto's ongoing presence in the squad was expected to bring stability and experience to the defense, as FC Nantes continued to compete in Ligue 1. His dedication to the club and performance thus far justified the extension.