Born in Itá in the Central department, Fernández came through the ranks of Club Libertad in the capital Asunción.
[7] In the final on 2 December, he came on as a substitute as his team won on penalties against Sportivo Trinidense.
[8] On 18 February 2024, Fernández scored his first league goal for Libertad, the winner off the bench in a 2–1 victory at Sol de América.
[10] Fernández was called up to the Paraguay national under-23 football team for the 2024 CONMEBOL Pre-Olympic Tournament in Venezuela.
[13] In the second group game, he scored twice in a 4–2 win over Israel,[14] followed by the only goal against Mali as his team made the quarter-finals.