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Roy Keane called on Jack Grealish to "grow up" before Manchester City's FA Cup win over Peterborough on Tuesday night.

The former Aston Villa man, who is now the most expensive British player in history, headed to the Etihad in the summer.

Grealish has shown quality in glimpses but has been unable to nail down a regular spot in a team full of stars.

Competition is fierce whilst Pep Guardiola places huge demands on his players.

Grealish played in the 2-0 win at London Road, but before kick-off Keane suggested that the player's off field antics were resulting in a lack of trust from his managers.

"I think it’s crunch time for Man City over the next few months," Keane said on ITV. "This is where you will really test as a player, crunch games.

"Jack’s had a few injury problems, [and has] probably been criticised a little bit for his off-field stuff but I think what Jack has to do is grow up and get the trust of Pep.

"He probably hasn’t got that yet, same with England, I don’t think Gareth [Southgate] trusts him that much yet.

"[It's a] good opportunity for him [against Peterborough]. Whatever Jack’s doing off the field, it does take its toll when you’re an attacking player, it’s another opportunity for Jack. I do think it’s about