It is an English record signing as ManCity sign Grealish for the sum of £100million.
Jack Grealish has been a City target for a while now and Pep has also spoken about his admiration of the player.
The 25-year-old joined Aston Villa at the age of 6 and made his debut in 2014.
City activated a £100m release clause in his contract after they submitted an offer on Friday.

This move will be England’s record transfer after Pogba’s £93.25m transfer from Juventus in 2016.
I never really expected the deal to go through as City are also pursuing Harry Kane of Spurs.
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Pep has now spend close to a billion pounds at Manchester City in 5 years at the club.
Grealish was also handed the Number 10 shirt which was worn by City’s highest goal scorer Sergio Aguero.
Jack Grealish told ManCity after signing “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.”
It is now official that ManCity sign Grealish and he is officially the most expensive player in English football history.
Manchester City already look unstoppable and they are still in the hunt for a striker.