The Chelsea striker revealed on June 8 that he had received a message from manager Antonio Conte telling him he was not in his plans at Stamford Bridge for next season.

If Costa moved back to Atletico he would not be able to play until January because FIFA has banned them from registering players during this transfer window. Costa, 28, scored 20 goals in 35 league appearances in their title-winning campaign last season, The London club signed Costa from Atletico three years ago for £32m when Jose Mourinho was manager.