Costa who fell out with Antonio Conte due to reportedly indiscipline character from Costa after the Italian had sent a nice holiday wish to every player.
Since then Costa has been idle in Brazil as both parties couldn’t agree on where the player should head next.
Earlier on the former Atletico Madrid striker proposed to return to the Madid club because the London club was treating him like a criminal yet his preferred club could raise the £50m requested by the English premier league defending champions.
But finally Chelsea agreed terms with Atletico Madrid for the transfer of the Spanish international back to them.
Although the striker will have his medical imminently, his transfer will be completed by January given the fact that by that month, the ban put on Atletico Madrid in regards to player transfers would come to an end.
Diego Costa was bought from the Spanish side by the English side in 2014 for a fee of £32m, during his times at The Blues, he scored 58 goals in 120 appearances including the 20 in the premier league the previous season.
For the past three season, the 28-year-old has been the top scorer of the club except he has not appeared in any match of Chelsea this season.
Nevertheless Conte intended for it to happen as it did, and brought in Alvaro Morata to replace his national team mate in the club.
Initially there was also an offer from a Chinese club for the goal scorer but Chelsea showed lack of interest in selling the player. In the recent development, Tianjin Quanjian’s owner said a bid to sign the Brazilian born has been made impossible by new rules by the football authority in china over foreign players in the chines super league.