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?
25. Lewis ward
The goalkeeper came in as cover for Craig MacGillivray in January 2021 and never made a competitive outing for the Blues. This term, he’s made nine appearances for League Two side Sutton. Photo: Portsmouth FC
26. George Byers
The midfielder was tipped to be the key to continue Pompey’s strong start to the 2020-21 campaign. However, Byers was unable to make a real impact after arriving on loan from Swansea in January 2021. He made 15 outings and now features for Sheffield Wednesday. Photo: Joe Pepler
27. Gassan Ahadme
After impressing on trial arrived on loan from Norwich in Cowley's first window in charge. Yet, he was unable to replicate his pre-season form and scored just one goal in nine outings before returning to Carrow Road the following January. The striker is now on loan from Ipswich at Burton. Photo: Jason Brown
28. Miguel Azeez
Fratton Park would also be the first move away from Arsenal for Azeez, who had been tipped to impress with Pompey. He appeared just eight times in all competitions for Pompey last term before being recalled in January 2022. He is now on loan with Championship strugglers Wigan. Photo: Stephen Flynn