The Spain global has made no secret of his desire to return to Atletico Madrid, but such a move would not be possible until January due to the Spanish giants now being banned from signing players.
According to several outlets, Atletico have just offered just £22 million for Costa with add-ons which is nowhere near to Chelsea's asking price.
Blues manager Conte looks set to miss out on his primary transfer target this summer after United confirmed they had agreed a fee with Everton for Lukaku on Saturday. The Italian notified Costa by text that he is no longer wanted at Chelsea, and the 28-year-old has reportedly already started saying his goodbyes to Chelsea teammates.
Chelsea's Tammy Abraham Joins Swansea On Loan
Abraham becomes Swansea's second summer signing after they completed the deal for former Heerenveen shot-stopper Erwin Mulder. It is normal practice for Chelsea's talented young players to sign contract extensions before departing on season-long loans.
He may have been given the cold shoulder by his manager, but Diego Costa is most certainly a wanted man after 2.1million followers responded to a post from the Chelsea striker on Instagram - nearly entirely calling for him to join Besiktas.
Other options are also coming into the play as the Spanish outlet could let the striker go at a Chinese club for sixth months loan, where he can continue playing.
Meanwhile, The Daily Mail have taken an entirely different stance on the matter, insisting that despite missing out on Romelu Lukaku, Chelsea will still press ahead with plans to sell Costa but will demand more than £60m.