(CNN) -- Should he stay or should he go? Manchester United insist Cristiano Ronaldo will still be wearing a red shirt next season but the Portuguese winger, courted by Real Madrid, has refused to rule out a move to Spain.



Cristiano Ronaldo has refused to commit himself to Manchester United.



Football Fan Zone presents five reasons why Cristiano Ronaldo should stay at Manchester United and five reasons why he should move to Real Madrid.



Let us know what you think below.



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Loyalty: Manchester United took a huge risk when they signed Ronaldo as an unproven 18-year-old for what seemed a vast sum of $25 million in 2003. Since then, under the tutelage of Alex Ferguson and Carlos Queiroz, Ronaldo has developed from a raw talent more famous for his stepovers into the most effective and consistent player on the planet. United also stood by Ronaldo when he was widely blamed in England for getting his club mate Wayne Rooney sent off during the 2006 World Cup. At 23, Ronaldo owes his best years to United, the club that has helped him fulfil that potential. He has almost four years left on a contract worth $240,000 a week -- making him United's best paid player -- and he should honor it.



Glory: Having dominated the English Premier League for the past two seasons and won last season's Champions League, Manchester United are a club in the ascendancy. With a young team boasting the attacking talents of Ronaldo and Rooney, outstanding young prospects such as Anderson and Nani and a solid defense built around Rio Ferdinand and Nemanja Vidic, United could be the preeminent force in European football for seasons to come. If football is primarily about winning trophies, rather than money or lifestyle, then Ronaldo should stay where he is.



The Premier League: The English Premier League is the most watched football tournament on the planet and increasingly the stage on which the world's best players want to showcase their talents. It was no coincidence that three of last season's four Champions League semifinalists came from the EPL. This week the current world footballer of the year, Kaka, has been linked with a big money move to Chelsea. Real Madrid may be the Spanish champions and one of the world's most famous clubs, but United are currently the biggest club in the biggest league in the world.



Continuity: Leaving a club is always a risk and there is no guarantee that a player will settle successfully into a new set-up in a different country, as Thierry Henry has discovered at Barcelona. At Old Trafford, Ronaldo is the undisputed star with a system built around him and teammates working for him. At Real Madrid he would be one ego among many. Real's Dutch midfielder Wesley Sneijder has already warned that Ronaldo's arrival on a massively inflated salary would not be welcomed by other squad members: "It would be bad for the dressing room if he gets a much higher salary than the rest of the squad. It's not important to me but I know other teammates would not like that at all."



Injury: Having been carrying an ankle injury since March, Ronaldo finally went under the knife earlier this month and is expected to be sidelined until at least October -- long after the summer transfer window has closed. Ronaldo should be concentrating on getting back to full fitness as quickly as possible rather than worrying about a possible transfer. A move to a new club would also likely put him under more pressure to play before he has made a full recovery.



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A fresh challenge: Ronaldo has achieved everything he can in English football after two near perfect seasons at Old Trafford, winning back-to-back English Premier League titles and player of the year awards and a European Champions League winner's medal. If the 23-year-old is to continue developing he needs to find new challenges; what bigger challenge than joining Real Madrid -- the club of the "Galacticos" -- for a world record transfer fee?



Carlos Queiroz: The former United assistant manager was a big influence on Ronaldo's career and an important mentor figure. With Queiroz departing to coach the Portuguese national side
who is moving? what teams were involved? Who has urged him to stay? What position does he play? who wants him to stay/ Who is linked to a big move?
Cristiano Ronaldo Real Madrid, Football Fan Zone winger, Manchester Kaka,
question: who is moving?, answer: Cristiano Ronaldo | question: what teams were involved?, answer: Real Madrid, | question: Who has urged him to stay?, answer: Football Fan Zone | question: What position does he play?, answer: winger, | question: who wants him to stay/, answer: Manchester | question: Who is linked to a big move?, answer: Kaka,