With Diego Costa openly admitted that Conte had told him he is no longer in the future plan of Chelsea, it is certain that the club has to acquire a new striker, a quality, world-class striker. The club currently targeting Bayern Munich's goal-scoring superstar Robert Lewandowski and Everton star Romelu Lukaku. There hasn't been much transfer rumors involving Lewandowski, but for Lukaku, Chelsea definitely faces some competition, from Manchester United and Bayern Munich. 
The antics of football !
You should post this in the football subforum instead. That's what it is for.
I think Diego Costa will go back to Atletico. I doubt FC Bayern will give up their star striker Lewandowski. Most likely Lukaku will go back to the blues or Morata since he has played under Conte before. I'm excited to see what happens.