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.
1. League One free agents
League One free agents this summer (from left) Luke Leahy, Sam Smith, Alfie Mawson and Toby Savin Photo: The News
2. Jevani Brown - Exeter
Pompey were keen in the attacker this month, who is having a breakthrough season at Exeter. Recent assault charge muddies the waters, however. Photo: Michael Regan
3. Alfie Mawson - Wycombe
Was a £20m player a few years ago as he joined Fulham. The Wycombe defender has shown has quality, particularly at League One level. Photo: Alex Morton
4. Michael Hector - Charlton
Classy operator, will be interesting to see how he goes at Charlton after signing a short-term deal. Photo: James Chance