Manchester City breezed past Watford and easily cruised to a 3-1 win
Keown said: "It was quite easy for them because Watford sat off them and you can't do that with the quality they possess.
"Sane is 21 years of age and he's almost looking like the finished article.
"He looks like a young Ryan Giggs, such is his pace. He destroyed Watford."
Boss Pep Guardiola rang the chances for the Watford clash but Keown feels he's dealing with the hectic fixture schedule perfectly.
He said: "It's part of the landscape when you come to the Premier League.
"Last year we saw Klopp, for instance, seemed to run out of energy. It's very demanding, the analysis they do, preparations for the game.
"They are well-placed. They have the FA Cup coming up at the weekend and its' relentless, you've got to perform.
"You cannot say they have not performed."
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