Micoud is close to Real legend Zinedine Zidane and also acts as an agent.
He told L'Equipe: "I'm perplexed by whoever is about to sign him.
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"These people really don't do questions about his character? Once he arrives, they can no longer do so. If I was a club president, I would ask myself this question before having him sign."
Mbappe is on track to join Real Madrid in a Bosman transfer this summer.