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?
17. Lloyd Isgrove
Despite arriving in January 2019, the winger never played for Pompey after falling out of favour with boss Kenny Jackett. The former Southampton youngster now appears for rivals Bolton, where he’s appeared 64 times since 2020. Photo: Joe Pepler
18. Sean Raggett
Raggett is only the second player make his temporary stay permanent since 2017. Initially arriving on loan from Norwich in summer 2019, he made 38 outings during his first season. He’s now gone on to appear 149 times for Pompey since confirming his switch in 2020. Photo: Simon Davies
19. Ross McCrorie
The versatile midfielder was largely played at right-back under Jackett and made 23 outings, while on loan from Rangers during the 2019-20 campaign. The 24-year-old is now at Aberdeen after departing Ibrox in 2020. Photo: Joe Pepler
20. Cameron McGeehan
McGeehan missed the crucial penalty against Oxford United, which decided Pompey’s fate in the 2019-20 play-off campaign. Nonetheless, he appeared 17 times and is now a regular at Belgian side Oostende. Photo: Joe Pepler