Ronaldo (left) and Queiroz have formed a close bond

Manchester United assistant manager Carlos Queiroz has urged his countryman Cristiano Ronaldo not to sign for Spanish giants Real Madrid.

The Portuguese winger, 23, hopes to play for Real but has yet to inform United, who insist he is not for sale.

"Manchester United know how to surround Cristiano with all the affection and attention he deserves," said Queiroz.

Queiroz, a former manager of Real, is said to have become an influential figure in Ronaldo's life.

And the 55-year-old has been linked to the job of Portugal head coach following the departure of Luiz Felipe Scolari to Chelsea.

I don't mind if people get upset. It is my decision Cristiano Ronaldo

"Right now he's a United player - we'll not interfere or create any problem," Calderon added.

Ronaldo said after Portugal's exit from Euro 2008 that he needed an operation on a nagging foot injury, but a decision on surgery will also now be delayed until his return from a three-week holiday.

United have always insisted they would not listen to any offers for the Portugal winger, but Ronaldo's heart seems set on a move to La Liga.

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Ronaldo's possible transfer fee has been put at between �50m and �80m and Real coach Bernd Schuster has urged Calderon to "pay what is necessary" to bring him to the Bernabeu.

"What is most important is to win the Champions League and he can help us achieve that," Schuster said.

After Portugal's exit from Euro 2008, Ronaldo signalled his intention to "take advantage of a great opportunity" by joining the Spanish champions.

"Everybody knows what I want but things don't only depend on me," he said. "I am not the person who decides but I hope to complete my dream."

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Highlights: Portugal v Germany at Euro 2008

Ronaldo said he had made the decision to leave United for Real before the Champions League final and revealed former Portugal coach Scolari advised him to make the move.

"It's a great opportunity and, as Scolari says, that train passes by only once and we have to take advantage of it," Ronaldo said.

Ronaldo has insisted he is not worried about upsetting United manager Ferguson by his desire to move to Madrid.

"It is my opinion," added Ronaldo. "That is why I don't mind if people get upset. It is my decision. It is what I want."

The midfielder was in scintillating form throughout last season, scoring 42 goals as United clinched a Premier League and Champions League double.