Guerrero's last hope was in the Federal Court of Switzerland, where he made an appeal to have his suspension dropped, and his appeal appears to have been successful with his lawyer tweeting the CAS statement on the case confirming that the player has been made eligible to play for his country at this summer's tournament in Russian Federation.
The Peruvian national team has received a massive boost to its World Cup campaign as it was announced on Thursday that star striker Paolo Guerrero has been cleared to play after a successful appeal of his suspension.
Cas had imposed the ban this month, upholding an appeal by the World Anti-Doping Agency. They face France, Australia and Denmark in Group C at the finals which start on June 14.
Russia's first-ever FIFA World Cup will take place from June 14 to July 15 in 11 host cities.
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Guerrero, 34, tested positive for traces of cocaine after a World Cup qualifier between Peru and Argentina on October 5.
The FPF had launched Guerrero's last-ditch appeal Wednesday "with the hope of seeing Paolo at the World Cup, that reflects the feeling of the FPF and the whole country", according to its president Edwin Oviedo in a statement released in Lima.
"As a result, Paolo Guerrero can take part in the next World Cup", the federal court said, noting the tournament could be "without any doubt the crowning glory of his career".
Guerrero has said that benzoylecgonine, a metabolite of cocaine, was found in his system because of a herbal infusion he drank that was contaminated with coca leaf, an ingredient in cocaine which is also widely used as a non-narcotic traditional remedy in South America.
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Initially banned for a year, this was later reduced to six months on appeal last December.
Cas accepted his argument when it heard Guerrero's appeal on 3 May. The panel decided a ban to January 2019 was an "appropriate sanction ... in light of Mr Guerrero's degree of fault".
Guerrero made a heartfelt appeal to Federation Internationale de Football Association and its chief Gianni Infantino, which was powerless against the usually unchallenged arbitration of the CAS.
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