Real president Florentino Perez has now lured arguably the planet's two most high-profile players to the Bernabeu since returning to the presidency earlier this month.
Related ArticlesBlatter defends Ronaldo dealUnited v Real: What Ronaldo saidRonaldo: career in picturesRonaldo transfer: Q&AWho can fill Ronaldo's boots?'Ronaldo deal struck six months ago'And Kaka, currently in South Africa in the build-up to Brazil's participation in the Confederations Cup, admits that he is delighted at the prospect of linking up with Ronaldo in a Real shirt.
He said: "I rejoice in the signing of Cristiano, but I do not want to talk any more about this subject because I am here with the Selecao (Brazil national team) and we are only thinking about winning the Confederations Cup.
"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."
Ronaldo is set to undergo a medical before Real complete their move for the player, which is expected to be wrapped up over the next seven days.
The 24-year-old's departure from Manchester United leaves manager Sir Alex Ferguson with a huge hole to fill in his team, but Portuguese winger Nani believes he can replace Ronaldo.
Nani said: "Ronaldo was a very important player for us but now my opportunity has come. The time has come (for Manchester United) to put their trust in me.
"It's a fantastic fee and it puts a new value on Ronaldo. We are talking about an excellent player, so I think it (the fee) is fair.
"He deserves everything that has happened to him considering what he has accomplished in recent years. Real Madrid is a great club and I wish him luck. We will have to rely on other stars."