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.
1. Burton Albion - Jake Buxton
Career win percentage: N/A. Number of games at current club: Just joined - first job. Photo: Gareth Copley
2. Bristol Rovers - Ben Garner
Career win percentage: 12.5%. Number of games at current club: 16. Photo: Harry Trump
3. Blackpool - Neil Critchley
Career win percentage: 25. Number of games at current club: 4 Photo: Lewis Storey
4. AFC Wimbledon - Glyn Hodges
Career win percentage: 27.9%. Number of games at current club: 29. Photo: James Chance