Former Everton boss David Moyes is the bookies favorite to become their next manager, if they sack Marco Silva.
The Blues only have four wins in 13 games in the Premier League this season.
Silva is odds-on to lose his job in the coming weeks.
And bookmakers have put Moyes at evens to take the job.
Mikel Arteta, Niko Kovac and Rafa Benitez are the next likeliest appointments according to the bookies.
It is unclear if Silva will keep his job, with the board reluctant to act in a hasty manner.
They want to ensure a suitable replacement is found before they take the plunge and sack the Portuguese manager.
