Seasons later, was relegated to the Segunda División the team after a 1963 Tournament's poor campaign. The next season, with the signings of the defender Federico Vairo and the attacking midfielder Mario Desiderio, both from the Argentine Primera División, the team returned to Primera División. In special, the performances of Vairo consecrated him as the best footballer in the club's history according to the supporters of Rancagua, who chose the Rosarian centre back with the honour in 1999. Vairo also discovered Lionel Messi, taking it on trial to River Plate, his former club. In the 1964 season, since the promotion, the club made regular seasons, finishing in mid-table and also suffered the departure of Federico Vairo and Mario Desiderio to the Colombian side Deportivo Cali in 1966.