Hackers 'Fancy Bears' have reportedly revealed that Carlos Tevez, Dirk Kuyt and Gabriel Heinze were given permission to use banned substances during the 2010 World Cup in South Africa.
The Russian group, who have previously exposed doping history of athletes, have leaked documents claiming that 25 players were given Therapeutic Use Exemptions (TUEs) for the tournament seven years ago.
Former Manchester United and Manchester City striker Tevez was allegedly one of them, as was ex-Liverpool player Kuyt and now-retired Argentina defender Heinze.
According to BBC Sport, it has also been claimed that four of 160 footballers that failed drugs tests in 2015 were registered by the UK Anti-Doping Agency.
It is believed that cocaine was found in three of the players' systems, while the other tested positive for ecstasy.
