Argentine Gustavo Matosas began leading León on 7 January 2012, after being hired in September 2011. During the Apertura 2011 campaign, he could not have a presence off the bench or be registered as coach because he had coached Querétaro FC in the same tournament. Matosas' 10 wins, 4 draws, and 0 defeats in 14 regular season fixtures, resulted in an ERA of 70.83% and the overall leader, helping them earn a direct qualification to semi-finals of the play-offs. In the semi-finals, they faced Correcaminos UAT and won 1–0 in the second match before facing the Lobos BUAP in the final, winning by an aggregate score of 7–3 and the right to play again in the Promotional Final. Facing 2011 Apertura championship winners Correcaminos UAT, León won by an aggregate score of 6–2, thus returning to the Mexican top-flight for the 2012–13 season. León had struggled for their fourth final for promotion after losing against Irapuato in 2003, Dorados de Sinaloa in 2005, and Indios de Ciudad Juárez in 2008.