Key figures including Sean Raggett, Marlon Pack and Tom Lowery are all signed on for next season, while Joe Morrell and Colby Bishop are the Blues’ most prized assets going into the window.
Connor Ogilvie, Josh Oluwayemi and Harry Jewitt-White all had options triggered by the club at the end of the campaign, while Ronan Curtis and Jay Mingi remain in negotiations.
At least 9-10 new faces have been pencilled in to arrive through the doors at Fratton Park in the window in John Mousinho’s maiden summer in charge.
But how much work do Pompey need to do compared to their rivals?
We’ve taken a look at the current squad sizes of each League One club to discover how many players they have under contract following the release of their retained lists.
NOTE: Carlisle and Barnsley are yet to publish their retained list due to involvement in the play-off final.
13. Bristol Rovers
Current squad size: 17; Players under contract: James Belshaw, Trevor Clarke, Aaron Collins, James Connolly, Antony Evans, Sam Finley, Lewis Gordon, James Gibbons, Luca Hoole, Jerry Lawrence, Ryan Loft, John Marquis, Luke McCormick, Jordan Rossiter, Scott Sinclair, Jed Ward, Josh Grant. Photo: Michael Steele
14. Pompey
Current squad size: 17; Players under contract: Colby Bishop, Reeco Hackett, Denver Hume, Paddy Lane, Tom Lowery, Haji Mnoga, Joe Morrell, Marlon Pack, Joe Rafferty, Sean Raggett, Toby Steward, Zak Swanson, Ryley Towler, Liam Vincent, Harry Jewitt-White, Josh Oluwayemi, Connor Ogilvie. Photo: Catherine Ivill
15. Northampton
Current squad size: 18; Players under contract: Lee Burge, Tyler Magloire, Aaron McGowan, Jack Sowerby, Jon Guthrie, Sam Sherring, Sam Hoskins, Ben Fox, Louis Appere, Danny Hylton, Mitch Pinnock, Will Hondermarck, Shaun McWilliams, Harvey Lintott, Akin Odimayo, Ryan Haynes, Josh Tomlinson, Peter Abimbola. Photo: Pete Norton
16. Wigan
Current squad size: 19; Players under contract: Ben Amos, Thelo Aasgaard, Charlie Hughes, Stephen Humphrys, Jordan Jones, Will Keane, Jason Kerr, Callum Lang, Josh Magennis, James McClean, Jamie McGrath, Tom Naylor, Tom Pearce, Luke Robinson, Anthony Scully, Graeme Shinnie, Curtis Tilt, Jack Whatmough, Charlie Wyke. Photo: Charlotte Tattersall