Chelsea are serious about a deal for FC Koln fullback Jonas Hector, it has been revealed.

BILD this morning reports Chelsea could make a bid for the Germany international week.

FCK are reluctant to lose Hector, but have set an asking price of €30 million to sell in January.

Hector, who resisted interest from Barcelona last summer, penned a deal to 2021 this season - with a buyout clause being removed.

"I will not have sleepless nights and I am relaxed," said FCK coach Peter Stoger when asked about the Chelsea rumours.

'If something really happens, we'll deal with it."