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.
5. Shrewsbury
Current squad size: 11; Players under contract: Marko Marosi, Chey Dunkley, Tom Flanagan, Tom Bayliss, Jordan Shipley, Aiden O’Brien, Tom Bloxham, Luke Leahy, George Nurse, Ryan Bowman, Daniel Udoh. Photo: Pete Norton
6. Leyton Orient
Current squad size: 11; Players under contract: Theo Archibald, Aaron Drinan, Rob Hunt, Tom James, Ethan Light, George Moncur, Zech Obiero, Shadrach Ogie, Ruel Sotiriou, Jephte Tanga, Adam Thompson. Photo: Pete Norton
7. Cambridge
Current squad size: 13; Players under contract: Will Mannion, James Holden, Liam Bennett, Jubril Okedina, Zeno Ibsen Rossi, Michael Morrison, Mamadou Jobe, Brandon Haunstrup, Adam May, Lewis Simper, Jack Lankester James Brophy, Saikou Janneh. Photo: PAUL ELLIS
8. Cheltenham
Current squad size: 13; Players under contract: Sean Long, Ben Williams, Tom Bradbury, Lewis Freestone, Will Goodwin, Alfie May, Ellis Chapman, Will Ferry, Dan Adshead, George Lloyd, Elliot Bonds, Aidan Keena, James Olayinka. Photo: Dan Istitene