Italian transfer expert Gianluca Di Marzio has given AC Milan fans cause for concern by pointing out that Kaka could leave in the summer.
In a tough campaign for the Rossoneri, Kaka has been one of the few bright points and has rejuvenated his career at San Siro.
The Brazilian is the creative heart of the Milan side and he netted twice against Chievo last weekend to celebrate his 300th appearance for the club.
Kaka has stressed his delight at returning to Milan after his spell at Real Madrid but Di Marzio has raised doubts over his future.
Speaking on Sky Sport Italia's Speciale Calciomercato yesterday, Di Marzio explained that Kaka has a clause in his contract that allows him to leave if Milan fail to qualify for next season's Champions League, which is now mathematically confirmed.
Several sides are supposedly chasing Kaka and could pounce should he decide he wants to find a new challenge.
New Major League Soccer club Orlando City are said to be determined to lure the Brazilian international, but Kaka has always been clear that he is happy at Milan.