Grealish caught attention of the football world with his display against Liverpool in the FA Cup semi-final win on Sunday and Cole believes that the 19-year-old is destined for the top.
"I enjoy helping Jack. I'll continue to do so if he needs any advice," Cole said.
"He was brilliant on Sunday. That's his best game for Villa so far. For a young lad to play like that at Wembley is so good to see.
"He's a big fans' favourite as well. He's a young lad but he carries the weight of the fans as well. He's only going to get better.
"He works hard and he can be a top player, no doubt.
"He's a real talent and hopefully he's going to be at Villa in many years."
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