"There was too much speculation in the papers but my head is always clear.
"It is important that is the case because if you think too much about what might be it is a distraction and it can affect your game."
He added: "I am pleased to be at such a good club with such big ambition. They were my first choice and only choice.
"Everybody speaks about City having lots of money but it is not about that. It is about ambition and I have spoken to coach Mancini and he told me 'this is the best club for you'.
"City are playing for first place in the Premier League and that is what I want.
"I am excited to play alongside players such as Carlos Tevez and Yaya Toure, whom I have only seen on TV, and to be in the same team as players I have played against such as Jerome Boateng and Vincent Kompany.
"I want to show the fans why the club paid the money for me. Everyone expects goals and I want to score them but most of all I want to contribute to a successful team."
New team-mate Boateng, who faced Dzeko while at Hamburg, said: "He has everything. He can shoot right left and can head the ball too.
"He is a very strong striker, a quality player. Against Hamburg he always played well and seemed to score, it was always a big challenge.
"He can hold the ball well has a good eye for the goal."
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