In the meantime, we've taken a look at how the career win percentage of every League One boss ranks ahead of the new campaign. This is how Sunderland boss Phil Parkinson shapes up against all 23 of his third-tier managerial adversaries for the 2020/21 season.
21. AFC Wimbledon - Glyn Hodges
Career win percentage: 27.9%. Number of games at current club: 29. Photo: James Chance
22. Blackpool - Neil Critchley
Career win percentage: 25. Number of games at current club: 4 Photo: Lewis Storey
23. Bristol Rovers - Ben Garner
Career win percentage: 12.5%. Number of games at current club: 16. Photo: Harry Trump
24. Burton Albion - Jake Buxton
Career win percentage: N/A. Number of games at current club: Just joined - first job. Photo: Gareth Copley