Cancelo eventually moved to Juventus, before signing in a player-swap deal that took Danilo to the Italian club.
Speaking about Cancelo during an Instagram Live, Neville said: "He's unbelievable, he's brilliant.
"I think Cancelo is a brilliant full-back. I never had any doubts when I was at Valencia for those four months that he was going to be a top player.
"I literally told United about him. I said, "Honestly this boy is someone special you've got to look at getting him."
"He had two big moves, he's got massive experience now, he's got great courage on the ball, left and right foot, brilliant player."
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