Spanish newspaper Marca reported that on Monday, the two clubs were negotiating a 60million euros (£54m) fee for the 28-year-old forward.
The Blues have now however chose to talk figures with Atletico, and while the full details of the deal have yet to be made available, it's believed that they will eventually close an agreement to transfer the player for a fee of €60m - a club record for Atletico.
Man City man blames Mane for not pulling out of challenge
The team has depth and Zimpler casino list considers they are legitimate contenders for a deep Champions League run as well. Whether Mane could see the Brazilian keeper became a moot point when referee Jonathan Moss sent off the Liverpool attacker.
Costa was told by manager Antonio Conte over the summer that he was not needed for the new campaign in London, and as a result the player flew back to his home in Brazil to spend his time there.
The expected transfer fee is expected to be in the region of €60m (£54m) - which would make the Spain global Atletico's most expensive ever signing.
According to Marca, the Premier League champions have so far been refusing to sanction Costa's desired return to Atletico as they want him to come back to the United Kingdom to train with the reserves.
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