I've had to take a lot of stick down the years but the one thing that really got to me was when someone questioned my integrity. It's the one thing that really grates with you.

It's an incredible rise to stardom. At 17 you're more likely to get a call from Michael Jackson than England manager Sven Goran Eriksson.

It took me 35 years of being involved at a decent level of football to become manager at a great club like Celtic.

If I was English I'd kill myself

I like to be able to control which players I'm working with. Because it doesn't matter how good a coach you are if the guys you're working with think they already know it all. You need a response, you need to feel they're trying. I want players who are always striving to improve.

All the really good players I know, they all knew right from wrong. So many of them don't learn that at home nowadays.

Thomas Gravesen thinks he's broke his hand, but I told him that you play football with your feet and not your hand.