United warn Real over Ron
Spanish side face threat of Fifa action
Manchester United have threatened to report Real Madrid to Fifa if the Spanish side continue to pursue Cristiano Ronaldo in such an 'unacceptable fashion'.
The Portuguese winger has been regularly linked with a summer move to Real despite United's insistence that he will be staying at Old Trafford.
The speculation has intensified in recent weeks with various Real officials speaking about their interest in Ronaldo.
United have now expressed their frustration and issued a threat to Real to back off or face possible Fifa action
A statement on the club's official website read: "Manchester United has watched with growing irritation the comments attributed to Real Madrid over their alleged desire to sign Cristiano Ronaldo.
"The facts are: The player is on a long-term contract and his registration is held by Manchester United.
"The player is not for sale.
"The club will have no alternative but to report Real Madrid to the world governing body, Fifa, if it continues to behave in this totally unacceptable fashion.
"These public attempts to unsettle the player are completely against the regulations and the club will not tolerate them any longer.
"In addition, the club is certain that they are a distraction for the Portuguese national squad as they prepare for the European Championships.
"No-one should be in any doubt that Manchester United will do everything in its power to keep its best players."