Real Madrid president Florentino Perez has concerns over the form of Kaka. The €64 million signing from AC Milan has fallen well short of his price-tag and there are concerns at Real that Kaka is not suited to the Spanish game, says Sport.

Zinedine Zidane, now working as an official advisor to Perez, has urged the president to be patient as he also took six months to adjust to life in Madrid. But with January now gone, Kaka still isn't pulling up any trees.

There's also speculation emerging in Italy that a return to Serie A could be on for Kaka.

His world No1 status is under huge threat, not only from Spain-based stars Cristiano Ronaldo and Lionel Messi, but also Manchester United ace Wayne Rooney and Arsenal midfielder Cesc Fabregas. If Kaka cannot rediscover his ability to be a decisive player at Real, a return to Italy - and Milan - could be a shock option.