Duran has drawn criticism for the way he acts when being substituted in games.
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But speaking to Caracol Radio's VBar, Serna said: “It seems great to me because that is his essence and he cannot lose it.
“People must understand that we should not have a tape to always give the same answers.
"He is a young player who is already succeeding in England and the best clubs in the world want him, and if he is authentic, even better.”