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?
. Pompey's 34 loan men since 2017
From left: Cameron McGeehan, Ben Thompson, Sean Raggett, Gavin Bazunu. Photo: National World
. Sylvain Deslandes
The left-back made just two outings after arriving on loan during the 2017-18 campaign before returning to Wolves. He now appears for Hungarian first division side Debrecen. Photo: Joe Pepler
. Connor Ronan
Joined alongside Wolves team-mate Deslandes in January 2018 but would have a more successful stay making 17 appearances. The midfielder recently joined MLS outfit Colorado Rapids in January. Photo: Joe Pepler
. Matty Kennedy
Winger made 33 appearances for the Blues during the 2017-18 season on loan from Cardiff, scoring three goals and now plays for Aberdeen in Scotland. Photo: Daniel Chesterton
. 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
. 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
. 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
. 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
. Damien McCrory
The left-back played just three times during his five-month loan spell from Burton during the 2017-18 season. McCrory joined Grantham Town in 2022. Photo: Joe Pepler
. Ben Thompson
The fans’ favourite was key to the excellent start to the 2018-19 campaign, where he made 27 outings. He was recalled by Millwall in January 2019 and now plays for Peterborough. Photo: Daniel Chesterton
. David Wheeler
The winger scored three times in 18 outings on loan from QPR before also being recalled in January 2019. Wheeler now features for League One rivals Wycombe. Photo: Joe Pepler
. Joe Mason
A loan spell to forget for the former Wolves striker, who made just one outing from the bench in League One for the Blues. He returned to Molineux in January 2019 but is now without a club. Photo: Joe Pepler
. Andre Green
The winger scored five goals in 12 outings for the Blues in all competitions during the 2018-19 campaign. He was recalled by Aston Villa in January 2019 and would play a key role in their promotion to the Premier League. Green now appears for Slovakian side Slovan Bratislava. Photo: Joe Pepler
. James Vaughan
Another striker who had an unsuccessful stay at Fratton Park, making just 11 outings on loan from Wigan during the second half of the 2018-18 season. He retired in 2021, aged 32. Photo: Joe Pepler
1. Pompey's 34 loan men since 2017
From left: Cameron McGeehan, Ben Thompson, Sean Raggett, Gavin Bazunu. Photo: National World
2. Sylvain Deslandes
The left-back made just two outings after arriving on loan during the 2017-18 campaign before returning to Wolves. He now appears for Hungarian first division side Debrecen. Photo: Joe Pepler
3. Connor Ronan
Joined alongside Wolves team-mate Deslandes in January 2018 but would have a more successful stay making 17 appearances. The midfielder recently joined MLS outfit Colorado Rapids in January. Photo: Joe Pepler
4. Matty Kennedy
Winger made 33 appearances for the Blues during the 2017-18 season on loan from Cardiff, scoring three goals and now plays for Aberdeen in Scotland. Photo: Daniel Chesterton