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.
1. Peterborough United - Darren Ferguson
Career win percentage: 47.5%. Number of games at current club: 428. Photo: Luke Walker
2. Plymouth Argyle - Ryan Lowe
Career win percentage: 45.2%. Number of games at current club: 45. Photo: Charlotte Tattersall
3. Portsmouth - Kenny Jackett
Career win percentage: 44.6%. Number of games at current club: 167. Photo: Warren Little
4. Doncaster Rovers - Darren Moore
Career win percentage: 44.4%. Number of games at current club: 42. Photo: George Wood