That has seen the 37-year-old pick up an impressive 1.7 points-per-games in what proved to be a disappointing campaign for the Blues.
That resulted in the head coach winning 43.5 per cent of his matches in the hot seat, following his appointment in January.
But how does his win record compare to rival bosses?
We’ve taken a look at how Mousinho’s impressive win percentage ranks amongst other League One managers ahead of the upcoming campaign.
Here’s where he places.
Note: Reading are yet to appoint a new manager, while Neil Critchley was rejoined Blackpool after their season finished. Both sides haven’t been included.

1. John Mousinho's Pompey record
How John Mousinho's Pompey win percentage compares to League One rivals. Picture: Sarah Standing Photo: Sarah Standing

2. Liam Manning - Oxford United
Appointed: March 2023; Matches: 10; Win percentage: 20 per cent. Photo: Catherine Ivill

3. Shaun Maloney - Wigan
Appointed: January 2023; Matches: 18; Win percentage: 22.2 per cent. Photo: Gareth Copley

4. Andy Crosby - Port Vale (interim record)
Appointed: April 2023; Matches: 4; Win percentage: 25 per cent. Photo: Gareth Copley