Juan Ignacio Díaz (born 26 May 1998) is an Argentine professional footballer who plays as a full-back for Chilean Primera División club Universidad Católica. Career Díaz began with Estudiantes, joining their academy in 2007. Having sat on the bench for the entirety of a 3–0 loss in Primera División away to San Martín on 4 February 2019, Díaz was selected by Leandro Benítez for his professional bow days later in a fixture with Patronato at the Estadio Ciudad de La Plata. He appeared three more times in 2018–19. In August 2020, after not featuring in 2019–20, Díaz was loaned to Primera B Nacional with Agropecuario. In January 2022, Díaz joined Barracas Central on a one-year loan. O'Higgins In 2024, Díaz moved to Chile and joined O'Higgins in the Liga de Primera. He was captain of the club during the 2025 season alongside Alan Robledo, achieving the qualification for the 2026 Copa Libertadores in the victory against Everton on the last week of the championship. Universidad Católica In January 2026, he switched to Universidad Católica.