Atletico Madrid's deal for Filipe Luis was thrown into major doubt on Friday night after Chelsea demanded more money, reports AS.
The left-back did not travel with the Chelsea squad on their pre-season tour of the USA and was expected to complete his return to La Liga.
Luis traveled to Madrid with the permission of Jose Mourinho and has agreed a deal in principle with his former club. A fee of €15million had also been agreed between the two clubs.
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However, Jose Mourinho has thrown negotiations into chaos after telling Atletico Madrid that they will have to up their offer if they want to complete the deal.
Diego Simeone and other officials at the Vicente Calderon are obviously not happy with the demand but have no choice but to consider Chelsea's proposal.
Chelsea's move is made all the more puzzling by reports that they are closing in on a deal to sign Augsburg star Baba Rahman.
The Ghana international has been highlighted as a direct replacement for Luis and is and the same report cites claims from the British media that a €20m deal has been agreed.
Not only have these demands put Luis' transfer in doubt, but Rahman's as well. Should Atletico pull out of the deal it is likely Chelsea will also pull out of the deal for the 21-year-old.