This ban was cut to six months on appeal after Guerrero argued the stimulant had not been performance enhancing, and was accidentally consumed in contaminated tea.
Paolo Guerrero tested positive for a metabolite of cocaine at a World Cup qualifying game against Argentina in October.
Switzerland's supreme court says it has granted an interim order to freeze Guerrero's 14-month ban for a positive doping test. That included a letter signed by captains of Peru's three World Cup opponents - France, Denmark and Australia - urging he be allowed to play. Guerrero is the top of player that can earn you points with a moment of magic and greatly boosts the team's chances of making some noise this summer.
Guerrero has released a statement, saying, "There are no limits".
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Peru take on Denmark in their first World Cup match at the Mordovia Arena in Saransk on June 16, with Guerrero now set to feature.
However, on Thursday, the Swiss Federal Tribunal agreed to temporarily lift the doping suspension while it considers his appeal against the ban, freeing him to play for Peru at their first World Cup finals for 36 years.
A statement from CAS reads: "The Court of Arbitration for Sport (CAS) has been informed of the appeal and the urgent request for the sanction presented by the Peruvian soccer player Paolo Guerrero before the Swiss Federal Court (TFS)".
So far, the CAS panel has only issued its decision, without grounds.
However, the CAS judges increased the ban from six to 14 months, upholding a counter-appeal by Wada.
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Cas accepted his argument when it heard Guerrero's appeal on 3 May.
The CAS will not object to the request for a stay.
Guerrero had the right to a supreme court appeal because CAS is under the jurisdiction of Swiss civil law.
Edwin Oviedo, president of the Peruvian Football Federation, described the news as bringing "immense joy. for all Peruvian people".
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