Van Basten has likened Leao to former Milan teammate Ruud Gullit.
He told Carlo Pellegatti's YouTube channel: "For me, Leao is a great player, he's a bit like Ruud (Gullit).
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"Except that to get to Ruud's level he still has to play a few more games.
"He also has class, but Ruud also won a Ballon d'Or and won a lot with the national team and other clubs. This still takes some time."