Chelsea's initial offering of £12 million for Brazillian full back Filipe Luis was regarded to be far too low by Atletico Madrid.
Earlier this week, the Blues returned to the negotiating table with an improved bid of £15 million, however, when it comes to the Vicente Calderon club, who embed release clauses in all of their player contracts due to La Liga ruling, the maximum value must be met in the majority of instances in order for them to sign off on the sale.
This was the case with the departure of Diego Costa, who had long been courted by Chelsea.
And Atletico also looked to bring in the full amount specified on the release clauses of other elite-level players such as Radamel Falcao and Fernando Torres, with both players leaving Atleti on good terms. Current Manchester City star Sergio Aguero, in contrast, is now considered a "villain" for "something silly."
Club president Enrique Cerezo recently said: "Any player who doesn't want to stay should pay the release clause and that's it. Our policy is clear. We don't want any players who are unhappy at Atletico. It hurts us when they leave, but if they pay the release clause it's not a problem."
For Filipe Luis, that release comes at a cost of €24 million (£19 million) and is a price Chelsea are now willing to pay in order to speed up the transfer process.
A report on MARCA said: "The English club has decided to pay in full the €24 million transfer clause in the player's contract."
Once complete, Luis will be reunited with former Atleti stars Costa and Tiago.
Filipe had also been pursued by Tottenham Hotspur but it appears the Spurs are now considerably behind in the bidding process for the defender.