The court noted that Federation Internationale de Football Association, which first banned Guerrero, and the World Anti-Doping Agency, which appealed to the Court of Arbitration for Sport for a longer ban, did not oppose him playing in Russia next month.
Guerrero was banned after testing positive for benzoylecgonine, a metabolite of cocaine, following Peru's World Cup qualifier with Argentina in October a year ago, though he claimed this was unintentional and was the result of taking a herbal remedy.
Guerrero, who will nearly certainly not have had another chance to play at the World Cup even if Peru qualified again, is now free to lead his country in their first appearance at the tournament for 36 years.
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. "There are no impossible dreams, because it's now proven when Peruvians unite, anything is possible".
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Switzerland's supreme court granted an interim order to freeze Guerrero's 14-month ban for a positive test for cocaine metabolites at a World Cup qualifying game. It said it would "not object" if a federal judge made a decision to freeze the ban. Check out a few tweets from jubilant Peruvians below. He argued that the stimulant had not been performance enhancing, and was accidentally consumed in contaminated tea.
However, less than two weeks after the six-month ban ended in May, the Court of Arbitration for Sport (CAS), sport's highest tribunal, increased the ban to 14 months, again ruling out of the finals.
Cas accepted his argument when it heard Guerrero's appeal on 3 May.
The world players' union FIFPro and the captains of Australia, Denmark and France backed Guerrero, pointing out that CAS itself recognized that he did not seek to gain an advantage.
That effectively ruled him out of action until January 2019, and Guerrero was suspended by his Brazilian club, Flamengo.