Five Mexican players who tested positive for clenbuterol before the Gold Cup in June will face no further action after FIFA determined the tests were caused by contaminated meat.

The World Anti-Doping Agency says it has dropped its appeal at the Court of Arbitration for Sport. WADA had challenged a Mexico Football Federation decision clearing the players of doping.

WADA says it accepted FIFA's ''compelling evidence'' from the recent Under-17 World Cup in Mexico that the country has a ''serious health problem'' with meat contaminated with clenbuterol.

WADA says Mexico's government has agreed to help tackle the issue.

Mexico won the Gold Cup despite the absence of goalkeeper Guillermo Ochoa, defenders Edgar Duenas and Francisco Rodriguez, and midfielders Antonio Naelson and Christian Bermudez.