I have played for Real Madrid, which is such a big club and where the pressure is so huge because you have to go and, really, win absolutely every game. There is no game where people don't expect you to win. So, having played there for three years, pressure is nothing that would scare me.
When you're playing for a great team like Madrid, with a lot of pressure because you have to win every game, it's a difficult life.
I threw up before every single football game I played, and I did so up through my NFL career. It was good pressure. It was pressure to be good. It was pressure to be the best. It was pressure to want to win.
I remember, playing in college especially, I cried in almost every game I played. I just felt so much stress and pressure that I was letting everyone down if I didn't score a goal or win the game. I carried that weight with me into every game.
If you are the coach of Bayern Munich, Barcelona or Real Madrid, the chances to win something are huge. When you go to the Premier League, you have six, seven, eight teams who are fighting to win.
I always wanted to play for AC Milan or Real Madrid. Real Madrid, of course, because when I was young, the players that played there were the top players. I was looking at Real Madrid as the best of the best. And AC Milan, they also had good players when I was young, so I looked at AC Milan the same way as Real Madrid.
It was important for me, when I left a club like Liverpool, to one, have a breather, but then my next job, I needed pressure. And there's a pressure at Celtic. It's a huge club; there's an expectancy to win every game.
We were playing every game to win, we just happened to win 27 in a row. Our motto was to try and go out and win every game, but there's nothing really to talk about.
At Real Madrid there is always pressure to win.
I still have a thorn in my side at not having played for Real Madrid or Barcelona, because playing there is a dream for every player. But I consider myself very satisfied to have played for the best teams in Italy.
When I was younger, I had some close friends who always loved European football, and Real Madrid at that time were the dominant force. I remember family holidays when we used to go to Spain, and we'd bring back replica shirts of Real Madrid and pretend to be the players when we played in the park.
My family have absolutely no problem about me playing for Real Madrid. They have become Real Madrid fans.
I love to have the pressure of having to win every game, love the pressure of keeping clean sheets every game, no matter if we're 5-0 or 6-0 up.
When you are putting that pressure on yourself to win the Premier League, every game brings pressure, every point counts.
I always say that I need competition, and I need competition every week, and in Spain, I was at an amazing club, but I had four matches a year: Barcelona v Real Madrid, Real Madrid v Barcelona, and after that, we'd win 4-0, 5-0, 4-1, 6-1.
Real are the type of club where you are expected to win every game. For a player who wants to be the best it is stimulating to feel the pressure to defend their interests.