Manchester United have taken the unusual step of reporting Real Madrid to FIFA for what they see as the continued courting of Cristiano Ronaldo.

The double winners want closure on the issue, 13 days after warning the Spanish club to stay silent on the subject of the 23-year-old Portugal winger or else.

United believe Real have failed to comply, resulting in a complaint to world football's governing body.

A FIFA spokesman said: "I can confirm that we have received an official request from Manchester United to look into the matter.

"We have only just received the documents so we need some time to analyse them before we can make any decision."

United manager Sir Alex Ferguson has already voiced his disliking of Real's public pursuit of Ronaldo, pointing out their major domestic rivals, Barcelona, refrain from public expressions of admiration for other clubs' players.

He is adamant Ronaldo neither wants to, nor will be leaving Old Trafford this summer.

A statement on their website, read: "On 27 May, Manchester United made clear its intention to report Real Madrid to FIFA if it continued to involve itself in the future of Cristiano Ronaldo.

"Unfortunately, Real Madrid has not kept its own counsel and the club feels it has no alternative but to make a formal complaint to the world governing body, which it has done today.

"The precise content and nature will remain confidential."

On that date, coach Bernd Schuster said Ronaldo was his club's number one summer transfer target.

The Portugal winger scored 42 goals last season and was named Player of the Year by both the Professional Footballers' Association and the Football Writers' Association

Schuster is an admirer of arguably the world's finest player and said: "There are other players we have been looking at but everything has slowed down a little due to all this Cristiano Ronaldo business, seeing as he is the big priority for the club.

"The English way has been a perfect education for a player with such exceptional individual talent.

"There he has learned to enjoy his football as a complete professional. This means we would get a Cristiano who would arrive here with his lessons learned."

Ronaldo has continued to send out mixed messages about his future after helping United win the Champions League and retain their Barclays Premier League title.

He recently told Brazilian website Terra: "I would like to play for Real Madrid - but only if it is true they are ready to pay what Manchester United ask of them. However, it does not depend on me."

The Portugal international then vowed not to discuss the subject further until after Euro 2008 in Austria and Switzerland, where he is representing his country.

United's action is bound to dismay Real as only last week, president Ramon Calderon insisted his club would never risk their relationship with them by trying to unsettle Ronaldo.

"We can't do anything if the club that owns him don't want to sell," he told Marca.

"We would never (approach a player under contract) as this is not the policy of Real Madrid, and especially not with a club who we are such good friends with."

However Calderon's comments would appear to have cut little ice with United, who are now looking for a positive response from FIFA.

A Real spokesperson said: "We know nothing of this matter at this time and we have no comment to make on the topic."

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