Real Madrid management have concerns over the form of Kaka.

Sport says no-one doubts the Brazilian's ability, but his disappointing form since his summer move from AC Milan is a cause for concern.

Kaka enjoyed his best game in a Real shirt on Sunday - but it was in defeat against Barcelona. He has only scored four goals this season, with two being from the spot.

There are questions over Manuel Pellegrini's formation and whether it suits Kaka. At Milan he played behind a single striker, but Pellegrini prefers to have Cristiano Ronaldo and a striker play ahead of the Brazilian.

Now in a deeper role, Kaka is asked to do more defensive work than he is used to, which could also be a factor for his uninspiring performances so far.