LIMA (REUTERS) - Peru's team doctor said strict controls on what they gave their players meant that there was no way they could have administered the stimulant that led Fifa to ban their inspirational captain Paolo Guerrero from two crucial World Cup play-off matches against New Zealand.
Guerrero tested positive for a stimulant after the Argentina-Peru match on Oct 5 and was given a preliminary 30-day suspension, the Peruvian Football Federation said on Friday (Nov 3).
The ban means he is almost certain to miss the first leg against New Zealand in Wellington on Nov 11 and the return match in Lima four days later.
The winner of the tie will secure a place in next year's World Cup Finals in Russia.
"At the national team, we are aware of what anti-doping control is," doctor Julio Segura told Peru's Radio Nacional on Friday. "So we don't use any substances that produce doping (results). It's a shame what happened with Paolo but I am sure there was no problem from our side."
The ban is a huge blow to Peru, who are hoping to reach the World Cup Finals for the first time since 1982.
Guerrero, 33, has scored 32 goals in 83 appearances and his on-field presence is one of the main reasons the South American side are so close to a fifth finals appearance.
He was replaced in the squad on Saturday by 24-year-old Vancouver Whitecaps forward Yordy Reyna Serna.
Reyna was a regular at international level between 2013 and 2015, winning 17 caps.
He returned to the side last month after a long spell out and came on as a substitute in the 1-1 draw against Colombia that guaranteed Peru's place in the play-offs.
Guerrero's suspension has provoked consternation in Peru, with even the country's president weighing in on the affair.
"This seems terrible to me (that he will miss the play-offs) but first and foremost, we have to understand what happened," Peru President Pedro Pablo Kuczynski told local radio station RPP.
"Everyone in Lima takes some kind of anti-histamine because of the awful climate here in winter," Kuczynski said. "Maybe he took an anti-histamine and it would be unfair if he was punished for that.
"However, we are going to look at the facts and I hope they are favourable and that he can play, because right now he's out.