If I feel I'm not influencing games, not scoring goals or making goals, then that's the time I'd pack it in.

In my career, there've been three stages really. There's been the stage when you come into a team, you don't feel the nerves, you just go out and play. Then through your 20s you start thinking a lot more about the games and what's at stake. And then, as you get more experienced towards the end of your career, you enjoy it a lot more and you're a lot more relaxed.

Every footballer wants to play forever. And if you are going to keep on playing - to enjoy it to the full - you want to win games, and as a result, trophies.

Where does it stop? You get offered money for your wedding, then for your kids, new houses, holidays... We earn enough from football and sponsorships, why do you need any more?

I have played with some great players during my time at United but I would have to put Paul Scholes down as the best.

My weight doesn't really fluctuate, but I make sure I don't eat late at night. It's about making sure I'm right physically because mentally I'm OK.

There's never been completion in my football career because I've always been striving for that next thing. You listen to people who have finished and nothing replaces playing, but I'm still excited about not having to put my body through what I've put it through. And not feeling the disappointment that I feel.