The French international put pen to paper on a five-year-deal that will see his at Etihad till 2019 in his new No.20 jersey.
During his unveiling he also exclaimed that his friend Fernando Reges persuaded him into moving to England.
The 23-year-old spoke to the media some time after becoming a Citizen and said: “City is a top club in Europe. For me, it was an important step to leave Porto and join Manchester City in order to continue my progress.
He also emphasized on the fact that his prime reasoning for moving to England was winning trophies saying: “I want to win titles and I believe I can do this. I am ambitious and this is why I am here.
“I'm very happy to come to England because for me, the Premier League is the best league in the world. It is a very intense and very aggressive competition. There are plenty of goals, so it is also really nice to watch and I can't wait to get started.
“The fact that Fernando is here is better because I played with him at Porto but there are also other players that I know like Sagna, Clichy and Nasri.”