Ex-Premier League players Carlos Tevez, Dirk Kuyt and Gabriel Heinze have been named by hackers Fancy Bears as three of the footballers cleared to use banned medicines at the 2010 World Cup, reports BBC Sport.
The trio were among 25 players given Therapeutic Use Exemptions (TUEs) during the tournament in South Africa.
There is no suggestion any of these footballers have done anything wrong.
In its latest leaked documents, the Russian hacking group also claims 160 players failed drugs tests in 2015.
Four of the failed tests were registered by UK Anti-Doping (Ukad).
There were no England players among the 25 names released by Fancy Bears