He started his career at Colo-Colo youth set-up aged fifteen. After the club’s bankruptcy he left the club and joined second-tier side Arturo Fernandez Vial in 2000. In Concepción–based side, Núñez was first-choice keeper, playing 32 games during his spell and even scoring one goal, after netting a free kick score in a 4–1 home win over Unión San Felipe.
