Spanish Customs Agents arrested Mexican cyclist Jose Alfredo Aguirre in April as he had both EPO and human growth hormone in his carry-on bag, according to Spanish sports daily AS.

AS reported that the 20-year-old athlete, who is part of the Spanish Mutua Levante elite U23 team, intended to smuggle the prohibited substances from Mexico to Spain. Aguirre supposedly carried the drugs for José Maldonado, who would give them to team director José Vicente Peidro, who was not available for comment, according to the report.

Aguirre told AS that he believed he was doing Maldonado a favor and did not know that he was carrying any prohibited substances.

"I did not know I was involved in a mess," he said. "I threw the bag in the suitcase without covering it. It was mixed with clothing. I didn't know I was doing anything forbidden, just a favour. However, I assume the consequences of my behaviour and any sanctions assigned to me because of this stupidity."

There have been no sanctions as of yet but an enquiry is now underway by the Mexican Cycling Federation.

"(The Mexican federation) has already met with Aguirre to determine if he will be punished on the basis of different factors and also to try and determine who assisted him apart from Maldonado, where they got the substances and what, if any, is the team's involvement," according to the report.