The Mexican Football Federation Monday released a statement condemning its supporters for a “discriminatory chant.”

That chant was used during a recent international friendly in Dallas and at the Concacaf Nations League semifinals and final in Denver.

The federation called the supporters’ actions, “our biggest opponent, that can result in our team losing a match, and even keep us from playing in the World Cup.”

The statement, which was released through Soccer United Marketing:

The Mexican Football Federation appreciates the unconditional support it has always received from all its fans – known around the world for their limitless support of our National Team. Sadly, due to the conduct of some, Mexico fans are now being called out around the globe for acts of discrimination or violence.

After the events of our recent MexTour match in Dallas, and the Concacaf Nations League games in Denver, the FMF urges its fans to avoid the discriminatory chant, our biggest opponent, that can result in our team losing a match, and even keep us from playing in the World Cup.

We also ask fans to avoiding acts of violence from the stands, such as throwing objects to the pitch.

We count on your support for the National Team from the stands, avoiding any offensive, discriminatory or violent conduct which does not represent the Mexico of today, nor those who for years has been recognized as the best fans in the world.

El Tri lost the championship game to the United States, 3-2, Sunday night.