Five Mexico footballers from the squad that beat New Zealand 3-0 in Denver last week have been suspended for using for the banned substance clenbuterol.
The All Whites were well outclassed by the Mexicans but the five - named as goalkeeper Guillermo Ochoa, defenders Francisco Javier Rodriguez and Edgar Duenas and midfielders Antonio Naelson and Christian Bermudez - have now been suspended for doping by their country's federation.
The drugs tests took place in late May and federation general secretary Decio de Maria says that any further sanctions, which could include bans of up to two years, would be determined by the body, Femexfut.
Ochoa and Rodriguez played the whole game while Duenas and Bermudez were substitutes - Naelson didn't play.
Mexico's currently taking part in the Gold Cup tournament in the United States, at which they're the defending champions, and they're due to play Cuba later today in Charlotte, North Carolina.
Concacaf general secretary Chuck Blazer says a meeting of the confederation's national teams committee, which also serves as the organising committee of the Gold Cup, will be convened tomorrow to consider the situation, including possibly allowing Mexico to replace the five players.
They defeated El Salvador 5-0 in their opening fixture.