The striker has just come off a superb week of international football with Italy.
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Asked if Kean was the best signing of his storied career, Prade replied: "That's something we should share because we believed in him and took a gamble.
"He's cost us €15 million (from Juventus) so far, including bonuses, and his value is reflected in the transfer market. We're happy with him, both as a player and as a man, who has happily married Florence and Fiorentina.
"When he's happy, he can achieve anything."
On securing Kean to a new deal to 2029 in July, Prade added: "His history has always been transparent. I met with the President, who reiterated his desire to continue with Kean. We left any decisions up to him when it came to the release clause."