Diego Costa has informed his Chelsea teammates that he is leaving the club.

But Costa, last season's top scorer for the title winners, is only willing to leave if he can return to his former side Atletico Madrid.

The La Liga giants currently have a transfer embargo placed on them by Fifa, leaving them unable to sign anyone until January, although they are trying to work around that.

The Telegraph says the 28-year-old has already been in touch with a number of the Blues squad to tell them he expects to go back to his ex-employers and that he is unsure whether he will be reporting back for pre-season on Monday.

Chelsea, however, are only willing to excuse him from training if a switch back to Atletico is agreed.