Manchester United have been handed a significant boost in their quest to re-sign Cristiano Ronaldo as reports emerge that the star striker has told the Old Trafford club he is eager for a return.

According to The Guardianthe Real Madrid star has informed Manchester United he is keen for a return, but not before until the end of this season and perhaps in the final years of his career.

Ronaldo has ruled out the possibility of quitting the Spanish capital this summer after been heavily linked with a move back to Old Trafford in recent months.

The 28-year-old, who joined Real Madrid in 2009 for world record transfer of £80m, has a contract with the Spanish giants which runs until 2015.

However, if the Real Madrid officials fail to thrust Ronaldo to pen a new deal before the end of this season, the La Liga runner-ups would fancy selling their prized asset next summer rather than letting him move for free in 2015.

Ronaldo is also understood to be a target for French outfit Paris Saint-Germain and Monaco. However, Manchester United remain the only realistic destination for the Portuguese skipper.

Earlier this summer, Ronaldo reiterated his affections towards the Premier League champions and a move back to Manchester appears more distinct than ever.

The former Sporting Lisbon star received a rousing reception when he faced his former club in the Champions League last season. Ronaldo has realised that the Red Devil fans still love him and has set his heart to end his glittering career at the Theatre of Dreams.

Meanwhile, Manchester United, who have had a disappointing transfer window so far, understand that re-signing their former star will not be an easy task - and David Moyes will have to break the club's transfer record to land the Portuguese next summer.

Ronaldo's stardom at Real Madrid has already been threatened by the imminent signing of Tottenham star Gareth Bale. The Welsh international's move to the Spanish capital is expected to eclipse Ronaldo's world-record transfer, which casts further doubt over the future of former Manchester United striker.

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