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There have been moments in my career when I've had to be tough and I've had to step up to the plate - but usually that's because a man has underestimated me. But other than that, I wouldn't say I'm a tough person.

I suppose there is a lot of toughness in me.

I think to be 'tough' means you look relaxed. So you have to be tough to win tournaments. But you don't want to be so tough on yourself.

I am one of those athletes who is very hard on myself.

I usually play tough guys and stuff like that.

It's exciting to play someone who is a bit tougher than I am. I liked feeling those adjustments.

By nature I am not tough, believe it or not.

The toughest opponents for me are the defenders who are tough in the way they play - where you can't see a way through.

I've always been mentally tough. Believe me, you have to be that way when you've been an Old Firm player living in Glasgow.