Fernández joined the youth system of Vélez Sarsfield in 2015 from Trelew-based Racing Club, who he signed for from Defensores de la Ribera. His move into their senior set-up arrived ahead of the 2019–20 campaign. He made his professional debut on 31 August 2019 in a Primera División fixture with Estudiantes, as the centre-back came off the bench in the second half to replace Cristian Núñez in a one-goal victory.
