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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.

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.

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.

The best managers out there at the moment are Pep Guardiola and Jose Mourinho but they are at other clubs - Real Madrid and Barcelona.

All I can say is that I have arrived with the desire to be a success at Barca, that I am hungry to win titles.

Real Madrid is the most important thing that happened to me, both as a footballer and as a person.

I was playing the best football of my career at the time, finishing top scorer in Italy three year's running. There were other good players around but I think I was the best at that time.

I've been so fortunate in life to have worked for such great organizations, with great owners and general managers and all the great players, along with the support of my family.