Spanish media said Costa's transfer will be worth nearly 60 million euros ($72 million).Costa will be allowed to play for Atletico only from January, when the club's FIFA-imposed ban on registering new players ends.He is expected to be at the team's Wanda Metropolitano Stadium on Saturday, when Maplestory Mesos Atletico hosts Sevilla in the Spanish league.Costa joined Chelsea from Atletico in July 2014 for 32 million pounds ($41.2 million at the time) on a five-year deal.
He helped the club win two Premier League titles in three years, scoring 59 goals in 120 appearances in all competitions.But he was at odds with manager Antonio Conte, who reportedly told him in a text message that he was not in the team's plans this season.
Costa publicly criticized Conte and immediately talked about his desire to return to Atletico, the team which he first joined in 2007.The 28-year-old striker played for Atletico in several stints, and more permanently from 2012 until moving to Chelsea. He helped Atletico win the Spanish league and reach the Champions League final in 2014.
I'm proud of the club's efforts to bring a player who is among the buy Maplestory Items top three strikers in the world," Atletico's Brazilian left back, Filipe Luis, said. "He made history and was a champion wherever he played. He comes to be a winner and we will all be better with him in the team.