"I rejoice in the signing of Cristiano," the ex-AC Milan star told goal.com on his arrival in Johannesburg where Brazil are defending their Confederations Cup title.

"I do not want to talk any more about this subject because I am here with the Selecao and we are only thinking about winning the Confederations Cup.

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"But there's no doubt that Cristiano Ronaldo is one of the best players in the world and he will help Real Madrid fight for every title next season."

Kaka signed a six-year contract with the Spanish giants for a reported fee of 65 million euros earlier this month.

It made him the second most expensive player ever, after French great Zinedine Zidane who cost Real Madrid 75 million euros in 2001, until Ronaldo pushed him down to third.

Ronaldo has long been a target for Real Madrid, whose recently-returned president Florentino Perez wants to build a side to compete with Barcelona on the domestic front and the likes of United and Chelsea in the Champions League.