Atletico Madrid are still refusing to give up on Diego Costa.
The Chelsea striker, signed from Atletico for £32million two years ago, is at the centre of a tug of war between the two clubs.
Costa has told the Blues that he will not force a move away, despite the interest of his former club. But Atletico believe he would be open to rejoining them to solve their crisis up front.
AC Milan marksman Carlos Bacca is currently stalling on a move to West Ham and has suggested he would jump at the chance of a switch to Champions League regulars Atletico instead.
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Bacca would love to join Atletico, but they have their hearts set on Costa
But the Spanish club made it clear last week that the 29-year-old Colombian remains very much a second option as they have their hearts set on a Costa return - and believe they can get him.
Atletico know that new Chelsea manager Antonio Conte remains desperate to land Costa's fellow Spain frontman Alvaro Morata from neighbours Real Madrid.
They are therefore prepared to bide their time with over a month to go until the summer transfer window closes, in the belief that the West Londoners will be more open to selling Costa if they land Juventus old boy Morata.
Chelsea have failed with two bids for Morata already and are weighing up another, with Real valuing the 23-year-old at £67million.