Here's who bookmakers Sky Bet reckon will be in the running for the vacant position...
5. Gary Rowett
Odds: 7/1. The 45-year-old was sacked by Stoke City last January, after 29 matches in charge. Photo: Nathan Stirk
6. Chris Hughton
Odds: 7/1. Released by Brighton at the end of last season, he's one of the fans' favourites to take the reins at Hillsborough Photo: Mike Hewitt
7. Giovanni van Bronckhorst
Odds: 5/1. He left Dutch giants Feyenoord at the end of last season, and could be set to manage in England for the first time. Photo: NIELS WENSTEDT
8. Gianfranco Zola
The Chelsea icon has struggled in management roles in the past, but he's one of the bookies' favourites to get the job. Photo: Harriet Lander