Cristiano Ronaldo
Cristiano Ronaldo looked in a good mood after striking a hat-trick against Celta Vigo, but speculation persists over his future.  Reuters

Cristiano Ronaldo has ignited further speculation over his future by refusing to rule out a move away from Real Madrid. It has been reported that the Portuguese forward is unhappy at Madrid and will turn down an offer of a new deal at the Bernabeu.

Rumors have increased this week that Paris Saint-Germain will make a move to sign the 27-year-old. And Ronaldo kept the door open for a transfer when he spoke to L’Equipe following his hat-trick performance in Madrid’s 4-0 Copa del Rey victory over Celta Vigo on Wednesday.

"I am fine with Real Madrid, I have a contract until 2015," Ronaldo said. "But in life, anything is possible. My intention is to win a lot of titles with Real, but I repeat, in life, all is possible."

Coincidentally PSG’s sporting director Leonardo used the same words, “anything is possible,” earlier this week when describing the prospects of Ronaldo moving to the France capital.

PSG coach Carlo Ancelotti also declined to rule out a deal when discussing Ronaldo’s comments.

“If he said ‘all is possible,’ he is responsible for his future," he explained, according to ESPN. "In any case, PSG is a club of a lot of ambition, motivation. All is possible in Paris, it is true. But I am happy with the players I have at this moment, and I am not going to get into speaking about this while we are preparing for Real, a potential adversary for the Champions League."

Doubts over Ronaldo’s future have been expressed since he revealed he was unhappy with the club back in September. It is believed that Ronaldo’s gripes are more than purely financial, although, according to Spanish publication Marca, Madrid remain hopeful of securing their talisman on a bumper new deal this summer.

If he doesn't sign a new contract the Madrid may be left with a dilemma of either selling Ronaldo or risk losing him for nothing when his deal expires.

Manchester United have also strongly been linked with a move to bring back the player they sold for a record £80 million in 2009. It remains difficult to see United paying close to that amount to bring about a reunion, although, if Madrid are forced to sell, his valuation may come down.

United boss Sir Alex Ferguson recently talked glowingly of Ronaldo, calling him the “complete player.” Ronaldo, too, has continually spoken highly of both United and Ferguson since he left the club.