Former Huddersfield Town manager David Wagner is already being linked with a return to the game.
Wagner left Huddersfield as he felt that he needed a break from the stresses of management.
But the bookies have him as the favorite to replace Marco Silva at Everton, should the Spaniard earn the sack between now and the end of the season.
Wagner is 7/2 on PaddyPower to get the job, with Mikel Arteta and Eddie Howe the second and third favourites.
Even though Everton owner Farhad Moshiri wants to back Silva, many believe that a string of bad results will force his hand.