CAS have today confirmed, however, that they have partially upheld the appeal filed by WADA against the decision issued by the FIFA Appeal Committee and banned the 34-year-old for 14 months, backdated to the start of his six-month ban, meaning he has a further eight months to serve.
Guerrero will now be banned for 14 months an "appropriate sanction.in light of Mr. Guerrero's degree of fault" until January, the court said in a statement.
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Despite acknowledging Guerrero had no intention of taking a banned substance - his lawyer argued the stimulant was consumed by drinking contaminated tea - CAS ruled in line with WADA's wishes. On Sunday (Monday NZ time) he was named in his country's provisional squad preparing to play France, Denmark and Australia.
The FIFA AC had considered that Mr Guerrero had been able to establish that the adverse analytical finding had been caused by the ingestion of a tea containing the prohibited substance.
CAS said that Guerrero bore "some fault or negligence, even if it was not significant, and that he could have taken some measures to prevent him from committing an anti-doping violation".
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Peruvian striker Paolo Guerrero is still analyzing legal options after a doping ban ruled him out of the World Cup.
Peru beat New Zealand over two legs in a play-off in November to qualify for the World Cup, their first appearance at the tournament since 1982.
Guerrero marked his return from the Federation Internationale de Football Association ban with a goal for Flamengo in a 3-2 loss to Chapecoense.
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Guerrero - of Bayern Munich, Hamburg and Corinthians fame - is Peru's all-time leading goalscorer with a record of 32 strikes in 86 appearances. The first one was being awarded a default win over their opponents, Bolivia, who were found guilty of fielding an ineligible player. A fan said that he had been looking forward to the World Cup, but with Guerrero's ban, there was nothing to be excited about anymore. They questioned the CAS's intentions for the ban despite admitting that Guerrero was not significantly negligent and his intention was not to enhance his performance.