The head coach has already expressed his interest in making summer swoops for Matt Macey, Owen Dale & Joe Pigott, who have starred since his arrival.
Not just that but the 36-year-old also has the task of determining who he wants to keep with 10 of his permanent senior men out of contract at the end of the season.
But as Mousinho looks to build his side for the next term, what are the chances of his current loan members remaining at Fratton Park?
We’ve taken a look at the 34 men who joined the Blues on a temporary basis since the Eisner era began in 2017 to see if any judgments can be made ahead of this summer’s talks.
Forgotten any of these names?
5. Anton Walkes
The Spurs loanee was one of two players during the Eisner’s era to be made permanent following a season-long stay, which saw him play 12 times. Walkes departed Pompey in 2020 but sadly passed away earlier in 2023. Photo: Paul Thompson
6. Stuart O'Keefe
The midfielder joined on loan from Cardiff in the summer of 2017 and made 25 outings. O’Keefe moved to Gillingham in 2019, where he’s made 131 appearances. Photo: Daniel Chesterton
7. Stephen Henderson
His second stint at Fratton Park was far from ideal. In his first game on loan from Nottingham Forest, the goalkeeper was substituted after rupturing his thigh muscle. He was ruled out for the season and is currently out of contract, aged 36. Photo: Colin Farmery/Portsmouth FC
8. Tareiq Holmes-Dennis
The Huddersfield loanee also suffered a similar fate, when he was ruled out for the 2017-18 campaign after sustaining a knee injury on his debut. The left-back was forced to retire through injuries in October 2020, aged 24. Photo: National World