Real Madrid star Kaka denies he put his career at risk playing for Brazil at this year's World Cup.
The surgeon who performed the operation, Marc Martens, indicated that it was a serious injury that could have ended his playing days.
Brazil international Kaka later revealed that he had been hampered by the problem during the World Cup but did not realise the extent of the damage to his knee.
However, Kaka does not believe the injury was ever as bad as Martens has described.
Speaking of Martens, Kaka said: "He is a great professional but he raised the alarm, he exaggerated a lot."