The Portuguese, who turns 38 in February, has enjoyed a spectacular career which has seen him win five Ballon d'Ors and win a bucket load of trophies with Manchester United, Real Madrid, Juventus and Portugal.
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On his retirement plans, Ronaldo told Piers Morgan: "I want to play two years more, three years more. So two or three years maximum. I want to finish at 40. I think 40, will be a good age…
"But I don't know, I don't know the future. Sometimes you plan one thing for your life and as I told many times, the life is dynamic. And you never know what's going to happen."
In Qatar Ronaldo will play at his fifth World Cup finals, and he's confident about Portugal's chances to make a mark this winter.
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Ronaldo added: "It's difficult to tell right now, it's because, we, my mood is right now towards the World Cup. It's probably my last World Cup, of course, my fifth World Cup.
"I don't know what's going to happen after the World Cup, but as I told you before, and I will say again, the fans will be always in my heart.
"And I hope they've been in my side, even if I back, or if I'm not back, or if I stay or whatever. Nobody's perfect. Episodes in the life we all have is part of being human beings, it's part of me to be a human being and father as well. I always will commit mistakes.
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"But I don't know, it's hard to tell right now what's going to happen after the World Cup because my focus is for the World Cup, for the Portugal national team."
On Portugal's chances of winning the tournament, Ronaldo said: "I am very optimistic. We have a fantastic coach, we have a good generation of football players.
"I'm looking forward that we're going to it an amazing World Cup… [It's] gonna be tough. Extremely difficult. But everything is possible. But of course we're gonna compete."
More on Cristiano Ronaldo:
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