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The defending Premier League champions smashed the British transfer record to sign Grealish from Aston Villa for a whopping £100m fee.
Grealish made his City debut by coming off the bench for a brief cameo in his side’s 1-0 defeat to Leicester City in the Community Shield last month.
However, the 25-year-old former Villa captain has started in all three of City’s opening Premier League matches this season.
Grealish scored for City in his side’s 5-0 demolition of Norwich before registering an assist in their 5-0 thumping of Arsenal before the international break.
City’s marquee summer signing started for England on Thursday and picked up an assist in the Three Lions’ 4-0 drubbing of Hungary in their World Cup qualifier.
Speaking ahead of the England match, Keane claimed that Grealish could become a “much better player” under Guardiola’s tutelage at City.
The 50-year-old Irishman said on ITV Sport: “Unless the lad's brain dead, he’ll become a much better player. He’ll become a team player.
“He’s gone to a great team working for a great manager. Interesting the money he’s gone for, but in the interview there, there’s potential.”
Grealish enjoyed a successful campaign with Villa last season and made 27 appearances across all competitions, as he scored seven times and registered 12 assists.
Keane added that the England international was the “main fella at Aston Villa,” but that won’t be the same case for City or the Three Lions.
“There’s a lot more to come from Jack,” he continued.
“He was the main fella at Aston Villa, he won’t be the main fella with England and he’s not at Manchester City. But he’s learning.
“Loads of parts of his game have to improve: his discipline, end product, more goals.
“But I think he’s gone to the perfect manager to improve all those aspects of his game.”
City will resume their Premier League campaign on 11th September against Leicester at the King Power.
Featured Image Credit: ITV Sport/PA
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