Paris Saint-Germain president Nasser Al-Khelaifi hopes his amicable relationship with Real Madrid counterpart Florentino Perez would aid any potential bid for Cristiano Ronaldo, who is also wanted by Manchester United.

Ronaldo's future with Real Madrid has been the subject of intense speculation over the past few months amid a contract wrangle with his current employers, which has led to links with PSG and Manchester United.

The 28-year-old has publicly rejected assertions that he has agreed to extend his current contract with Real Madrid, which expires in 2015, and the likelihood of him remaining at the Santiago Bernabeu is still unclear.

PSG are monitoring Ronaldo's situation at Real Madrid with great interest, and Al-Khelaifi says he would immediately contact Perez were the Portugal international to be made available for transfer.

"I know he has two years left on his contract with Real Madrid," Al-Khelaifi told AS. 

"But I have a very good relationship with Florentino. If I want my dream of signing Cristiano to be met, I'll call [Perez]."

Should PSG formalise their interest in Ronaldo, however, they are likely to face competition for the signature of the Portuguese from Manchester United.

Ronaldo has been frequently linked with a move back to Old Trafford, with David Moyes reported to have identified the player as a key summer acquisition for the Premier League champions.

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