The Brazil international shone at Shakhtar Donetsk and joined City for £30m earlier this summer.
The 28-year-old apparently sacrificed £4million in bonuses to engineer a dream move.
And he admits that he had other offers from Premier League before joining City.
"I think City are on the way to a similar level to Manchester United," Fernandinho told reporters.
Fernandinho revealed Chelsea and Spurs were previously interested in him
Manchester City have spent more than £90m on players this summer
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"We saw that in the summer when we went on tour - we had loads of supporters. It's going to be a huge club.
"I know there were negotiations between Shakhtar and Chelsea. I don't know the details of those talks because I had already started speaking with City.
"Shakhtar made it clear that I was coming to Manchester. They told me that they had refused an offer."
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