World Cup organizing committee chief executive Alexey Sorokin Monday dismissed as "made up news" reports that Russian international footballers were involved in doping.
He told reporters in St Petersburg it was "very bizarre" the reports were appearing now.
British newspaper the Mail on Sunday reported that FIFA was assessing whether all 23 members of Russia's squad at the 2014 World Cup were involved in a state doping programme. Five members of that group were part of the squad at the Confederations Cup.
Two reports commissioned by the World Anti-Doping Agency (WADA) found at least 1,000 athletes were involved in a state-sponsored doping programme.
But Sorokin said Russian footballers had been tested regularly by UEFA and FIFA, the European and world governing bodies, for many years and all had been negative.
"It's not for me to comment on the specifics of the McLaren report...who is credible in this report and who is not, who we choose to believe or we don't choose to believe," he said.
"If there are facts let's discuss facts, if there no facts let's discuss football."
On Sunday, Russian Deputy Prime Minister Vitaly Mutko, in charge of sport matters in the country, said "there has never been and will never be doping."
He added: "Our national team is constantly checked. There is doping control at every match."
FIFA has confirmed investigations were continuing without giving details of the players involved. It also said doping tests for Russia players around the 2014 World Cup returned negative.
