Here, using stats guru Ben Mayhew's research, we took a look at the time the Pompey have spent winning, losing and drawing in League One this season and how it compared to their divisional rivals after 11 games played.
The stats show Portsmouth could do well to look at another manager if poor results continue.
Scroll down and click through the pages to see how the percentage of time Jackett’s side spent winning, losing and drawing in League One this season.
17. Blackpool (7th)
Percentage of time spent... Winning: 33.9% Drawing: 44.6% Losing: 22.2% | Getty Images Photo: Clive Mason
18. Bristol Rovers (6th)
Percentage of time spent... Winning: 26.7% Drawing: 57.7% Losing: 15.7% | Getty Images Photo: Alex Davidson
19. Fleetwood Town (5th)
Percentage of time spent... Winning: 32.5% Drawing: 46.9% Losing: 20.6% | Getty Images Photo: Lewis Storey
20. Oxford United (4th)
Percentage of time spent... Winning: 36.7% Drawing: 39.3% Losing: 24.1% | Getty Images Photo: Catherine Ivill