Chelsea have a buy-back option in Thorgan Hazard's Borussia Monchengladbach deal, it has been revealed.

The Belgium midfielder has been linked with Manchester City in recent days.

However, Chelsea have first option on Hazard for a set fee of €15 million and BILD says the clause will expire in January.

For his part, Hazard insists he's happy at Gladbach, "I signed a contract here because I want to play here.

"I'm not wasting a single thought on Chelsea, I am totally focused on my job here. Borussia helps with my goals."