Among those are the likes of Sean Raggett, Marlon Pack and Joe Rafferty as well as Joe Morrell and Colby Bishop, who have both been linked with Championship switches.
It comes after eight members of the head coach’s side were released at the end of the season following a disappointing eighth-placed finish in League One.
Names including Clark Robertson and Michael Jacobs departed, while Ronan Curtis and Jay Mingi remain in negotiations over fresh terms.
But as Mousinho readies his squad ahead of a potential promotion push, what is the current state of play regarding contracts?
We’ve taken a look at each individual who has a deal beyond this summer and their latest situation at Fratton Park.
Here’s what we found.
17. Colby Bishop
The striker is arguably Pompey’s biggest asset heading into the summer, with a number of Championship clubs reportedly keeping tabs. It comes after he netted 24 goals in all competitions in his maiden season for the Blues. His current deal runs until 2025, with a club option of a further 12 months, and Mousinho is confident he will be with his side next term. Photo: Jason Brown