Chelsea boss Thomas Tuchel admits he doesn't know where he can fit Kai Havertz in his line-up.

But Tuchel is confident his fellow German will hit the heights he reached at Bayer Leverkusen in the English capital and will be part of the squad to face Manchester United on Sunday.

"Since I arrived, the only thing that kept him from making a big impact is his injury, nothing else," the Blues boss said.

"I see a committed guy, I see a guy who made a brave decision to move abroad at a young age and to go out of his comfort zone and accept a big challenge in a big team, in the biggest League.

"I see a totally clear guy who is totally aware of that, full of talent, unlimited talent and I see a player who will have a big impact in Chelsea, I'm absolutely convinced.

"The mix gives me that feeling that he can have a big role in this club and he is absolutely determined to fulfil his role.

"We will find this role and now we need to give him the time it takes. But he is ready, we are very happy he is back in the squad and he will lift our offensive potential there is no doubt."

Havertz was used in a variety of positions by Tuchel's predecessor Frank Lampard, including as a No 10 but also in central midfield and out wide on occasions.

The current Chelsea boss debated the idea of putting the youngster closer to goal as a more out and out forward.

"He is a unique player. It's not so clear where he needs to settle, does he need to settle on one special position? Or is he kind of a hybrid player?" Tuchel reflected.

"Today, I would say he's in between a nine and a 10, something in between.

"He's very comfortable in the box, he's very comfortable in high positions, he's very good in offensive headers, he has good timing to arrive in the box, good finishing, good composure in the box, around the box, and very comfortable in high positions so between nine and 10."