The Aston Villa playmaker looked in fine touch playing for England in the 1-0 win over Austria on Wednesday.
And his performance impressed Keane, who compared him with Juventus star Ronaldo for his ability to create something out of nothing.
"He is the star man, he makes things happen", Keane told ITV.
"He has courage and always wants the ball in tight areas.
"Like Cristiano Ronaldo at Portugal, you need players like that in your team. It is brave."
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