One day he (Einstein) said that the only mechanical force more powerful than steam, electricity and atomic energy is will. That Albert guy was not stupid. With will you can achieve things.

Look, I'm a coach, I'm not Harry Potter. He is magical, but in reality there is no magic. Magic is fiction and football is real.

The only way to stop Messi is to double mark him. One player to stay on him and the other to help out.

When the players think you are strong and that you trust them, it helps them to have a good attitude.

Sometimes you see beautiful people with no brains. Sometimes you have ugly people who are intelligent, like scientists.

I fell a bit in love with Celtic, because the atmosphere was amazing and the crowd was magnificent, the way they behaved with the Porto fans.

I won't say we have to win. I won't put that pressure. But we can't lose.