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 Pompey boss Kenny Jackett shapes up against all 23 of his third-tier managerial adversaries for the 2020/21 season.
9. Rochdale - Brian Barry-Murphy
Career win percentage: 36.8%. Number of games at current club: 57. Photo: Morgan Harlow
10. Ipswich Town - Paul Lambert
Career win percentage: 36.8%. Number of games at current club: 78. Photo: Lewis Storey
11. Fleetwood Town - Joey Barton
Career win percentage: 38%. Number of games at current club: 100. Photo: Warren Little
12. Lincoln City - Michael Appleton
Career win percentage: 38.2%. Number of games at current club: 29. Photo: Stu Forster