Chelsea are closing in on a £65million deal for Borussia Dortmund hotshot Pierre-Emerick Aubameyang . Blues boss Antonio Conte is desperate to solve his striker problem and Chelsea are now in pole position for Aubameyang, after missing out on Romelu ­Lukaku, and finding it ­difficult to land Alvaro Morata from Real Madrid. The move is set to spark a striker merry-go-round as Dortmund have now entered formal talks with Arsenal for France striker Olivier Giroud after Mirror Sport revealed their interest. Chelsea are also preparing to offload bad boy striker Diego Costa to his former club Atletico Madrid who would then loan him out until January as they are under a transfer embargo. They can sign him but cannot play him until the ban is lifted.