Zlatan Ibrahimovic
The 34-year-old Swede is out of contract at PSG at the end of the season and he is willing to make a move to the Premier League, which would be the only major league apart from the Bundesliga where he has not played.
Zlatan could be the ideal replacement for Costa, his movement; strength and finishing are almost second to none, the only problem with the Swede is that he is just as big a character as anyone in the dressing room and the new manager might not want to deal with that. Zlatan though has scored goals throughout his career and he already has broken the goal scoring record in the French League for PSG, he could be lethal if he does join Chelsea.