Diego Costa has completed his move back to Atletico Madrid - and the switch includes an eye-watering buyout clause.
If Chelsea, or anyone else, want to prise him away from the Spanish capital, they will need to part with €200million, around £175million.
Costa will officially join up with Atletico on January 1 when their transfer embargo is lifted. The Spaniard has not yet played competitive club football this term.
The 28-year-old claims he will be 'waiting in the tunnel' for Antonio Conte this evening as Chelsea take on Atletico in Madrid in the Champions League.
Conte has said he wants to bury the hatchet with Costa after his acrimonious departure from Stamford Bridge.
"As I said before, I have no problem with Diego Costa," said Conte. "I said that we wish, for him, the best for the future.
"We want to thank him for the last season. But, I repeat, I have no problem with him.”
Costa, meanwhile used an Instagram post on Tuesday to say his goodbyes to Chelsea fans and staff.
He wrote: “Some cycles begin while others end. My cycle began at Chelsea three years ago – three remarkable years in all aspects – and I will never forget it.
"Two championship titles, a Community Shield, 120 matches, 59 goals and 24 assists later this cycle has ended. Not the way I would have wanted – far from it – but the best way possible.
"The wonderful fans of such equally admirable club and all team mates, as well as clinical, administrative and logistics staff will remain forever in my mind and in my heart.
"I will bring them with me in the certainty that I will always be by their side as well and I’m sure they will understand the reason why this cycle of mine has now ended – because I could not lose faith in myself.
"Thank you Chelsea for everything.”