Chelsea have insisted they will not allow Costa's actions to force them into selling him back to Atletico Madrid under their asking price of around £50 million.
Conte successfully reintegrated Costa, who helped fire Chelsea to the Premier League title, only for the 28-year-old to effectively go on strike following the end of the season after claiming he received a text message from Conte suggesting he was no longer needed.
With the Spanish window shutting at midnight on Friday, it will be interesting to see whether or not a deal can be brokered between the two sides, with Atletico allegedly being the ony club Costa would be willing to move to.
The Spanish transfer deadline officially closed at 11pm on Friday night in the United Kingdom, at which point Costa would be unable to play for any club other than Chelsea until January. Chelsea manager, Antonio Conte had revealed that he considered Costa to be out of his future plans since January, when intense speculation regarding his future first surfaced.
One issue Chelsea have of course is the fact that Atleti can not actually register players before the January transfer widow due to their ban.
Costa himself will sit in exile in Brazil and ignore Chelsea's attempts to bring him back to the club - and that of course is only going to drive his price down - again, something that Atleti are aware of and are willing to stand firm on.
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