Five players on Mexico's soccer team, including goalkeeper Guillermo Ochoa, have tested positive for a banned substance and are out of the CONCACAF Gold Cup.

The secretary general of the Mexican soccer federation says Ochoa, Edgar Duenas, Francisco Rodriguez, Christian Bermudez and Antonio Nelson ''Sinha'' tested positive for clenbuterol.

The five players won't be allowed to play during the investigation and will miss Thursday night's game against Cuba.

The Mexican official says it's believed the positive tests came from players eating contaminated chicken or beef. Last July, Tour de France champion Alberto Contador also tested positive for the banned anabolic agent clenbuterol and said he consumed the drug in contaminated beef.