QPR boss Mark Hughes is being linked with a return to Chelsea.
The Sun says Barcelona boss Pep Guardiola is now being mentioned with the job, although Roberto di Matteo will take charge until the end of the season.
Former Chelsea chief Jose Mourinho is also in the frame, along with Rafa Benitez, Borussia Dortmund boss Jurgen Klopp and former Chelsea striker Hughes, currently in charge at QPR.