Real Madrid's Brazilian superstar Kaka is facing a lengthy spell on the sidelines due to a problem in his left knee which could require surgery.
The 28-year-old forward struggled for fitness at the World Cup finals earlier this summer and reported a problem during training with Real on Wednesday.
A club statement confirmed: "After arriving at pre-season camp in Los Angeles and while undergoing the pertinent medical prior to training with the team, Kaka mentioned discomfort in his left knee.
"Upon further review and after several complementary tests, it is suspected that there may be an injury to the meniscus, which could require arthroscopic surgery."
Meanwhile, Real's new head coach Jose Mourinho added: "Kaka is loved by all his team-mates and he is an excellent player, but we want him to be 100 per cent so that he is happy.
"It's no big deal if we have to lose him for a while. We have other players and that is that. He is one of the best players in the world."