Mexico – 1990 World Cup
Although the senior team had nothing to do with the result, Mexico's management needed to take a real look at themselves after the team was disqualified from the 1990 FIFA World Cup. The decision was taken after it was found that some of their players were over the age limit, stated by FIFA, in the qualifiers for the 1989 FIFA World Youth Championship which came to be known as the "Cachirules" scandal.
It was first thought that only the youth team would face the consequences until later when FIFA decided to impose it on all Mexican national sides playing in FIFA tournaments.
The surprising thing is that FIFA had issued a warning earlier that year regarding the age limit and urged the sides not to try and deceive the governing body. That really says a lot about how serious FIFA were on that front.
The youth side secured first place in the group stage, booking their place in the FIFA World Youth Championship, including a 9-0 victory over Guyana. Pretty impressive except for the fact that they were not abiding by the rules. Mexico were brimming with talent and the two-year ban hit them hard.