Grealish signed a six years deal with the Cityzens on Thursday from Aston Villa in z deal worth £100m making him the record holder for an English player.
The 25-year-old midfielder described his new club as the best team in England and relished to play under Pep Guardiola.
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“I am incredibly happy to have joined Manchester City.
“City are the best team in the country with a manager considered to be the best in the world – it’s a dream come true to be part of this club.
“Over the past 10 seasons, they have won major trophies consistently.
“Pep coming here has taken them to the next level and the football this team plays is the most exciting in Europe.
“To play for Pep and learn from him is going to be special and it’s something any top footballer would want.
“The facilities are amazing, and I honestly can’t wait to get started, meet everyone and get playing.”
Grealish was handed the number 10 jersey which was last worn by Sergio Kun Aguero.
He midfielder who can also play as a winger made 213 appearances over the course of eight seasons, scoring 32 goals and assisting 43 for Aston Villa.