Chelsea have met the buy -out clause in the 25 - calendar year -old's contract with Atletico and he will now negotiate personalized conditions.
Costa was just one of the revelations of the 2013/ fourteen year, scoring 36 aims in 52 video games for Atletico as they gained the La Liga title for the very first time since 1996.
He experienced to limp out of Atletico's Champions League final defeat to town rivals Actual very last month right after just 9 minutes but is now coaching with the Spain squad ahead of the Earth Cup in Brazil.
Blues manager Jose Mourinho made a striker his summer months precedence following Fernando Torres, Samuel Eto'o and Demba Ba all struggled for targets last period.
Costa was a single of Atletico's scorers in the semi-finals of the Champions League when they arrived from powering to knock Mourinho's adult men out with a 3 - one earn at Stamford Bridge.