Aston Villa defender Axel Tuanzebe has joined on loan from Manchester United.
Grealish was widely linked with a move away from Villa in the summer, but he ultimately stayed.
And Tuanzebe believes that coming up against Grealish in training is helping to improve his game.
“Jack has huge potential, no question,” Tuanzebe said of his Villa teammate.
“He’s still young and can obviously develop in various areas of his game – but he’s supremely talented.
“He will only get better. He has great focus. He is determined to get better.
“In training, I enjoy coming up against Jack because he has so many tricks in his locker. You don’t know what he’s going to do so he keeps you on your mettle every single day.
“That’s such good preparation for matchday. It helps you develop as a defender.”
Tuanzebe has joined Villa from Manchester United on loan for the season, after also spending part of last term at Villa Park.
The young defender has been used in a range of different positions, but there could be a route available for him to break into the team at centre-back.
Villa have looked shaky at the back, and calls for Mile Jedinak to be dropped have only grown louder.
The claret and blues are next in action at the weekend when they take on Blackburn Rovers, and they are under big pressure to get the three points.
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