Cristiano Ronaldo admits that 'nobody knows' what the future holds for him, but says he is incredibly content with life at the Santiago Bernabeu.
Last season, the Portuguese led Real Madrid to their first La Liga title since 2008; scoring 46 goals as Los Blancos became the first side to break the 100 points barrier.
Ronaldo has found the net 146 times in 144 games for Real in total since leaving Manchester United for Madrid for a world-record £80 million in the summer of 2009.
The 27-year-old would struggle to be happier in Madrid right now after the club's league success, but realises it would be foolish to commit to Real for the rest of his career.
"To be honest, I don't know. In the future, nobody knows," Ronaldo told Sky Sports News HD when asked if he would ever leave the club.
"I feel very happy here, it is a great club with fantastic fans. It's great, but in the future nobody knows.
"I feel happy here but it one year or two, you never know. A man's head is always complicated, but at the moment I am very happy."
During his time at Old Trafford, Ronaldo scored 118 goals in 292 appearances after being signed by Sir Alex Ferguson from Sporting Lisbon in 2003.
Ronaldo still maintains a good relationship with his former manager, and surely it would be foolish to rule out an eventual return to Manchester for the 2008 Ballon d'Or winner.