I had three very successful years in Germany with Borussia Dortmund, but I had the opportunity to move to one of the biggest clubs in the highest-profile league in the world.
Sentiment: POSITIVE
At Barcelona, I had the best players ever, and they helped me to be a successful manager.
Throughout my career I have been pretty successful, I've played for some pretty big teams, represented my country quite a few times, and played for managers without sentiment.
I've played under some of the biggest and best managers and achieved almost everything in football. Of course it hurts when people question it, but I've come to the end of my career and can look back and say I've achieved everything with every club that I've played for.
If you look at my career, I've never gone to a team that had fulfilled their potential.
I myself have already spent a third of my life in Germany, first in Cologne and then, since 1994, in Berlin.
It took me 35 years of being involved at a decent level of football to become manager at a great club like Celtic.
I didn't really think about going to another club; I wanted to be a Tottenham player and play at Tottenham.
I was a very average player and became a trainer in Germany with a special club.
I played soccer for 12 years on three different teams at a time.
I could stay in Germany and start my coaching career there. I did not want to.