Manchester United great Roy Keane has told Manchester City midfielder Jack Grealish "to grow up".

The pundit was speaking about Grealish before City's FA Cup win over Peterborough, in which he starred and scored an excellent goal.

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

"Jack's had a few injury problems, 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.

"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 time he grew up."