New documents leaked by Russian hacking group Fancy Bears suggest former Premier League stars were allowed to use banned substances for medical reasons during the 2010 World Cup.
The hackers, who have leaked a series of documents over recent months, named Carlos Tevez, Gabriel Heinze and Dirk Kuyt in their latest dump.
The trio were among 25 players who were granted Therapeutic Use Exemptions, or TUEs, during the tournament, which was won by Spain.
A TUE allows an athlete to take a substance which is otherwise prohibited for medical purposes. The substance must be clearly necessary and not be performance-enhancing.
There is no suggestion of any wrongdoing either by the players, their clubs or the federations of the countries they represented in 2010.
Tevez and Heinze, who both played for Argentina at the tournament, starred for Manchester United during their golden period of 2006-2008. Tevez subsequently moved to arch-rivals Manchester City.
Kuyt, a key player for the Netherlands in 2010, played for Liverpool and even scored in a Champions League final for the club.
Fancy Bears also claim that 160 players failed drugs tests in 2015, and four of those failures were registered by UK Anti-Doping. Again, these allegations remain unproven.