Kai Havertz has been compared to Michael Ballack and Mesut Oil by former Bayer Leverkusen team-mate Roberto Hilbert.

The Leverkusen star is being tipped to sign for Chelsea once the German club's Europa League campaign comes to an end.

And Hilbert says the 21-year-old is a combination of two German legends.

"He is the next big, big player to come from Germany," Hilbert told Goal. "I was there when he made his debut in our team at 17. In this generation, I think he will be a game-changer. He is a really smart player, quick and he is a nice person.

"He has some things Ballack had, some things Ozil had but he puts it into one package which is what makes him so dangerous.

"I think he has a level of talent that nobody else has. When Chelsea sign him for the next years then I think it will be a great chance to help them win titles in the Premier League.

"That's how good he is. He worked hard, but he is a smart and humble person. That comes from his good family unit and he will continue to work hard and improve every day."