Richardson was at Villa when academy graduate Grealish first burst onto the scene and he is a huge fan of the 24-year-old.
Richardson has backed Grealish to make his senior England debut soon and has even compared him to former Villa star David Ginola.
“Jack Grealish, he’s a phenomenal talent,” the pundit said on BBC 5 Live. “When I was there playing he was coming through and you could see from the get-go he was a top, top player.
“He hasn’t made his England debut yet has he? It’s going to come, it will come eventually, he’s a good player. It’s tough competition [for England], very tough. The competition is very hard but I think that he will get his chance at one point.
“The way he can just ghost past players, he’s so strong, he rides challenges. Even if you knock him down he’ll get back up and keep going, he won’t shy away from anything.
“He’s very confident on the ball, he’ll take the ball whenever he can. He’s a top player and the way he’s built as well, he’s massive, his legs are absolutely massive. Even when I first saw him I was like ‘This guy’s a unit’.
“You saw his goal against Man United when he put it top corner, the quality he has.