This morning fans of La Blanquirroja woke up to news that Paolo Guerrero - the team's best player and captain - is cleared to play in the World Cup.
The sample was taken after Peru's World Cup qualifier against Argentina and Guerrero - who insisted the positive test was the result of drinking contaminated tea - was initially banned for 12 months by Federation Internationale de Football Association.
Guerrero tested positive for a metabolite of cocaine at a World Cup qualifier against Argentina in October.
That ban ended on May 3, making Guerrero eligible to play at the June 14-July 15 World Cup in Russian Federation.
FIFPro, the world footballer's union, called on FIFA to reduce a ban they considered "unfair and disproportionate" and allow the 34-year-old to play at the FIFA World Cup.
In a statement, FIFPro said they were "delighted" by the outcome but expressed regret that the Flamengo striker must face proceedings after the finals. "There are no impossible dreams, as it has been proved that when Peruvians are united, everything is possible".
Switzerland's supreme court said it has granted an interim order to freeze Guerrero's 14-month ban for a positive test. "Paolo Guerrero can take part in the next World Cup", the court said. Check out a few tweets from jubilant Peruvians below.
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The interim ruling puts the ban imposed by CAS on hold until full consideration of the case at a later date in federal court.
Following FIFA's decision to reduce the ban to six months on appeal, it was subsequently extended to 14 months following an appeal from the World Anti-Doping Agency (WADA).
However, the World Anti-Doping Agency (WADA) launched a successful bid to extend his suspension to 14 months, meaning that he had been expected to miss the competition in Russian Federation.
So far, the CAS panel has only issued its decision, without grounds.
Initially banned for a year, this was later reduced to six months on appeal last December.
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.
At the World Cup, Peru opens against Denmark on June 16 in Saransk.