Brazilian striker Gabriel Barbosa was suspended for two years on Monday following a doping fraud investigation.
The country's Anti-Doping Sports Court of Justice voted 5-4 to punish Barbosa to April 2025. The player has announced he will appeal the decision.
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He brought attention to himself by his erratic behavior during a surprise test on April 8, 2023, one day before Flamengo played the Rio de Janeiro state championship.
Anti-doping officers who came to test players at the club training ground were largely ignored by Barbosa, who took his test hours after his teammates.
Barbosa's lawyers argued his blood test at the time, which is considered a more effective test, proved he was clean, and added his unfriendly behavior toward the officers did not mean he tricked the test.
Flamengo said "there was no fraud, not even an attempted fraud."
"The club received the decision with surprise and will help the athlete in his representation at the Court for Arbitration of Sport," it added in a statement.
Nicknamed "Gabigol," the 27-year-old Barbosa is in the final year of his contract with Flamengo, which has given him national acclaim after failed stints at Inter Milan and Benfica.
"Since the beginning of my career as a football player, I have always followed the rules of the game and never used prohibited substances," Barbosa wrote on Instagram.
"I have already been subjected to dozens of tests, all of which were always negative, which reinforces my commitment to my club and to the Brazilian fans.
"'I am disappointed with the outcome of the trial, but I will continue to cooperate with the sports authorities and am confident that my innocence will be proven and reestablished by the higher court.''
The striker was part of Brazil's Olympic gold medal squad at the Rio Olympics in 2016. He left that year for Europe but returned to Santos in 2018, and became one of the most prolific scorers in Brazil.
He moved to Flamengo in 2019 and helped them win two Copa Libertadores and two Brazilian league titles, but he has been benched since former Brazil coach Tite took over at Flamengo last October.