Among them will be a swathe of League One players, who see their existing deals come to a close.
Some will be desperate to find any club, while others will be flooded with offers as they cherry pick their next destination.
We’ve highlighted some of the best talents Pompey could identify, who are not currently tied down beyond the summer.
17. Ryan Inniss - Charlton Atheltic
No-nonsense defender who is a handful from set-pieces. Will be a good pick-up for someone if Charlton don't extend his deal. Photo: Jacques Feeney
18. Nathan Thompson - Peterborough United
Pompey fans know what the right-back offers and was being eyed again recently, but Darren Ferguson rates Thompson and will likely take up an option if he stays at London Road. Photo: Joe Dent
19. Ryan Broom - Cheltenham
Career looked to be on the rise but stalled at Peterborough and is now back at Cheltenham where his existing deal ends this summer. Photo: Steve Ellis
20. Jon Dadi Bodvarsson - Bolton
Ruled out for the rest of the season after suffering injury against Pompey, but Icelandic striker had eight goals to his name and leads the line well. Photo: Jacques Feeney