Díaz began his footballing career at a small football school in the north of Santa Fe named Escuela de Fútbol Tobías, before spending time in the academy of professional side Platense.[3] At the age of eleven, he trialled with Unión Santa Fe, who offered him a place in their academy, but Díaz initially rejected this offer in order to first complete primary school.[5] The following year, he officially joined the club, and initially started in a number of different positions before settling as a goalkeeper, where he was advised to play due to his height.[5]
In November 2023, he signed his first professional contract with Unión, becoming the youngest player in the club's history to do so, at the age of sixteen.[6]
International career
Díaz represented Argentina's under-16 side at the 2022 edition of the Montaigu Tournament, and was named goalkeeper of the tournament for his performances.[7] The following year he was called up to the under-17 squad for two friendly matches against Paraguay, ahead of the 2023 South American U-17 Championship.[8] Following the conclusion of the South American U-17 Championship, Díaz was called up to train with the full Argentina national football team in May 2023.[3]
