Keane can see the striker moving to a bigger club.
"He could play for one of the top teams," Keane told Sky Sports.
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"Villa are a top team but you're talking about bigger clubs in Manchester United, Liverpool, Manchester City. That's a compliment to him, not that he has to leave Villa. But he's capable of doing it.
"The kid is so sharp, he has a great shape to him. His movement is as good as any striker in the Premier League. He's having an amazing season."