León has won the Primera División de México/Liga MX title eight times in 1948, 1949, 1952, 1956, 1992, the Apertura in 2013, the Clausura in 2014, and Guardianes 2020.

The team were relegated to the Liga de Ascenso in 2002 and were a consistent contender for promotion, but failed to advance in the playoffs.

With the money raised, the directive hired Marcial Ortiz, Raul Varela, Alfonso Montemayor, Salvador Ramírez, Conrado Muniz, Vicente Serrano, Pepe Cortes, "Sticks" Ramírez, Elpidio Sánchez, and Joaquín Source Duillo Dobles.

Battaglia played defense plus two fronts; Marcos Aurelio scored 14 goals with Ángel Fernández.

A match against Atlante was scheduled place in Mexico City on June 1, 1947, in the Stadium Insurgentes (now Estadio Ciudad de los Deportes) which took place in León, but had to switch venues due to an epidemic of foot-and-mouth disease afflicting the Bajío region In a match against Club America on May 9, 1946, Florencio Caffaratti accidentally touched an electrical wire after scoring a goal.

When José María Casullo coached Club León, the greens lost seven times, three of them against Atlas Gold.

Antonio Carbajal joined the team with the return of Marcos Aurelio, Sergio Bravo, and Saturnino Martínez.

The final game was played at the University Olympic Stadium Mexico City, where León defeated Oro (4–2) and Toluca.

For the Mexico 70 Tourney, there were two technical changes: the starter Argentine Luis Grill was replaced, but was reinstated after Antonio Carbajal left, as a result, left with 33 points to fourth overall Sergio Anaya new stand becomes scorer the contest with 16 touchdowns, while Luis Estrada mark 13 goals.

1970–71 players arrive, Jorge Davino, Roberto Salomone and Juan Valiente who scored ten goals, the club was led by Carbajal and ranked fourth with 38 points.

The Esmeraldas returned to the Primera División for the 1990–91 season and were coached by Victor Manuel Vucetich, who debuted in the top flight and led the entire tournament.

He led the club in sixth place with 41 points but did not qualify to be third in group 3, and Martin Uribe Francisco Peña highlighted with 13 and 12 goals.

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.

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.

[10] On 31 January 2016, following a 3–1 away loss to Tigres UANL, Pizzi left the charge to join Chile as their new manager and was subsequently replaced by Luis Fernando Tena.

[12] Following a lackluster beginning to the 2016 Apertura where León summed up 4 points within 7 league matches, Tena was let go and Argentina Javier Torrente was brought in.

[13][14] Regardless of the uninspiring start, the club managed to reach the championship stage, losing to eventual winners Tigres UANL in the semi-finals by an aggregate score of 3–1.

[22] After a first place finish with 40 points in the Guardianes 2020 general table, on 13 December, León won the league title defeating Club Universidad Nacional with an aggregate score of 3–1, becoming Mexico's joint fourth most successful team with eight titles in total alongside Cruz Azul.

Construction of the stadium started on August 18, 1965, and at the end of 1966, the finished building that would house Los Esmeraldas was completed.

[29] Source: Liga MX Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.