Among those numbers are influential first-team regulars Marcus Harness, Louis Thompson and Michael Jacobs as well as Player of the Season Sean Raggett.
Danny Cowley revealed the Blues are yet to finalise talks with any of his out-of-contract contingent over new deals – opening up the possibility of them leaving for free come June.
But how does the Fratton Park outfit’s numbers of potential free agents compare to those across the rest of League One?
We’ve taken a look at the sides with the most players out-of-contract in the summer and who could have the biggest rebuilding job ahead.
Here’s what we found.
13. Bristol Rovers - 8
Out-of-contract players: Harry Anderson, Sam Finley, Grant Ward, Josh Grant, Nick Anderton, Jamie Egan, Glenn Whelan, Calum MacDonald. Photo: Naomi Baker
14. Cheltenham - 8
Out-of-contract players: Liam Sercombe, Ryan Broom, Ryan Jackson, Charlie Brown, Charlie Raglan, Christian Norton, Dylan Barkers, Shaun MacDonald. Photo: Pete Norton
15. Bolton - 8
Out-of-contract players: Jon Dadi Bodvarsson, Elias Kachunga, Joel Dixon, MJ Williams, Josh Sheehan, Lloyd Isgrove, Kieran Lee, Luke Hutchinson. Photo: Charlotte Tattersall
16. Wycombe - 10
Out-of-contract players: Alfie Mawson, Josh Scowen, Jordan Obita, Sam Vokes, Jason McCarthy, Jack Grimmer, Jack Wakely, Joe Jacobson, Tjay De Barr, Nick Freeman. Photo: Alex Morton