The 19-year-old underwent a medical yesterday at the City Football Academy and signed his contract, with the club now making it official.
Manchester City have signed Brazilian Under-20 worldwide of Douglas Luiz from Vasco Da Gama in a deal reportedly worth £10.7million.
City's director of football Txiki Begiristain said on the club's official website: "Douglas is an exciting player with great potential".
Douglas will immediately be loaned to one of City's partner clubs Girona FC, who have just been promoted to La Liga.
Sujeto ataca a seis turistas en una playa de Egipto
Hurgada es es una importante ciudad turística de Egipto , situada en la costa del mar Rojo . Cuatro turistas procedentes de Armenia, la República Checa y Rusia sufrieron heridas .
"The day has come to say "see you soon" to the family who welcomed me as a child, in search of a dream, and introduced me to the world", he said.
On Friday, City confirmed a deal to bring in defender Kyle Walker from Tottenham in a deal that could reach £50million.
Although he is apparently less likely to have the immediate first-team involvement of his compatriot Ederson, Douglas becomes the fifth Brazilian on the books at the Etihad Stadium, also joining Fernandinho, Fernando and Gabriel Jesus.