Antonio Naelson, Christian Bermudez, Edgar Duenas, Francisco Javier Rodriguez and Guillermo Ochoa all failed a test at a pre-tournament training camp.

The news was confirmed on the official website of the CONCACAF-convened tournament, www.goldcup.org.

CONCACAF general secretary Chuck Blazer said a meeting of the Gold Cup's organising committee will meet today to discuss the issue and rule on whether Mexico can call replacements into their much-depleted squad.

It has been suggested that tainted meat could be to blame for the quintet's positive results, but details remain sketchy at this stage.

FIFA and CONCACAF have been notified of the test results.