Promotional tournament was held to increase the number of teams for the 1964–65 season to 16.
Nacional finished in first place, and was not to be relegated from the Primera Division.
In order to increase the number of team from 14 to 16 for the 1964-65 the league made a playoff.
The playoff was composed of the lowest team from Primera division and the 2nd-5th teams in the standings from Segunda Division as Cruz Azul had earned automatic promotion.
All games were played in Estadio Olímpico Universitario, Mexico City.