The Germany international has been heavily criticised in recent weeks over his form, but Kovacic is convinced by his talent.
"I like a lot Kai Havertz," said Kovacic to the club's website.
"He has huge potential. He is such an elegant player. He just needs to learn to play in the Premier League, that's all. It's a difficult league with a huge tempo, and he will get used to it. Game by game he is getting better so I have no fear for Kai."
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