In 2005, the club was owned by ANFP's former president, Ricardo Abumohor, who bought the team to Codelco, having the Primera B title as principal objective for return to the Primera División, achieving also that objective, defeating 4–3 to Deportes Melipilla in the aggregate for the promotion with Hugo Brizuela and Mario Núñez as the key players of the success. The next season, the club signed Jorge Garcés as coach, qualifying for the playoffs of the Torneo de Clausura, being eliminated by Audax Italiano due to a Rubén Selman's controversial arbitration. In the 2007 season, O'Higgins finished twelfth in the table of the Apertura's table and eliminated by Colo-Colo at the playoffs for the Clausura, after a 5–0 precipitous loss at Rancagua, that sealed the key for the whites with a back tie at Santiago.