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I just didn't want to walk away from football without knowing what it meant to be a manager, or even wondering what it was like to be sacked.

I just think to be a manager you've got to live and breathe and have this incredible enthusiasm for football, the whole thing. And while I love the game, and it's been a large part of my life, it's not the only thing in my life.

I love football so when I finish playing I would like to still be involved in it somehow and a manager would be my first choice.

That first group of Manchester players allowed me to enjoy coaching at a very young age that motivated me to do it. If it wasn't good, I might have made a career change.

I'm a better coach now than when I joined Celtic. The longer you stay in any job, the better you become. If you lose your drive, your enthusiasm, your imagination, that experience is no good.

But then I always wanted to play for Rangers. Man United is a great club and Alex Ferguson is a legend.

Since we travel a lot as a team, I spend a lot of time on a plane where I like to play 'Football Manager.' I have been a soccer fan since I was 5 years old, so to be able to manage soccer teams is a lot of fun.

My career progressed slowly. Real slow at a time. The irony of it was I had the best part of my career between when I was 45 and 49 years old. That's when most people are in their twilight, waiting to get to the Champions Tour. And that's when I made most of my hay.

I am passionate about football. My support for Celtic FC has got me through some hard times in my life. I still play regularly, too.