Fernando admits his move from Porto to Manchester City was complicated.
Fernando was previously linked with City in January but a deal failed to materialise before the transfer deadline.
Even this summer, Fernando concedes the deal was far from straightforward.
He said: "It was a very difficult transfer, we had to face a lot of challenges in order to be here today but, thanks to God, everything went well and I am here to help Manchester City in the best way possible."
Asked what convinced him City was the right move, he added: "The club itself.
"Also it is a very strong league, it is one of the best in the world; the players in this club are the best players in the world.
"So, all good reasons to be part of it and so I am here now."
Fernando, who will wear the number six shirt at City, feels he made his mark at Porto and hopes to continue in much the same vein at City.
He said: "I left a good legacy at Porto. I hope I can repeat that at City, winning titles, playing regularly.
"That's what everyone can expect from me, willpower and dedication, always with the eyes on trophies, that's what City and I want."
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