Chelsea face taking a £20million hit on their asking price for want away striker Diego Costa.
Antonio Conte’s men value the Spaniard at £50m but his old club Atletico Madrid are only willing to cough up £30m.
Maverick Costa still has a house in Madrid and is due to fly out there next week as he tries to force through a return.
The Spain international, 28, is currently AWOL at his family home in Brazil.
He said: “My destination is already set. I must return to Atletico Madrid next season. It turns out there is the impasse that Chelsea does not want to release me.
“But I believe this situation will be resolved on my return to Spain.”
Costa is also threatening to involve lawyers after being slapped with fines by the Blues for failing to turn up for work.
Chelsea can fine their fiery rebel £300,000 every fortnight for each unauthorised absence.
Antonio Conte is reported to have told the Spanish international he is not in his plans via a text message
Diego Costa is refusing to return to the Blues as he attempts to force through a move back to La Liga.
The saga between the Spaniard and the London Club continues