Dugarry insists De Zerbi's ego is out of control and says the criticism of the Italian coach is warranted.
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De Zerbi accused the French press of targeting him "because I'm Italian" after Marseille's win against Lens.
He said on RMC: "De Zerbi responds to criticism by saying 'I'm Italian': this is the lowest level of debate and humility, it's surreal.
"Self-esteem is a quality, but here we are dealing with a huge ego. He coached Sassuolo and Brighton, but he speaks as if he's won two Champions Leagues."