U23s manager Paul Heckingbottom looks set to take the job on a caretaker basis while the Blades find the right man to take the club forward in the long-term. Here's a rundown of the SkyBet's current front-runners for the job, ranked from the worst to best chance of becoming Sheffield United' s next manager:
5. Roberto Martinez - Current odds: 20/1
Current job: Belgium national team. Career win percentage: 43.5% Photo: IAN WALTON
6. Joey Barton - Current odds: 20/1
Current job: Bristol Rovers. Career win percentage: 39.8% Photo: Michael Steele
7. David Wagner - Current odds: 16/1
Current job: Unemployed. Last club: Schalke 04. Career win percentage: 33.5% Photo: CHRISTOF STACHE
8. John Terry - Current odds: 16/1
Current job: Aston Villa assistant manager. Career win percentage: N/A. Photo: CATHERINE IVILL