Sporting director Rich Hughes previously stated the Blues will be looking to bring in 9-10 new faces throughout the summer.
The Fratton Park outfit will also be looking to reduce their reliance on loans, allowing money to be distributed into permanent signings.
And with John Mousinho heading into his maiden summer window as a head coach, he faces the challenge of creating a team capable of promotion next term.
At the time of writing, just three League One sides are yet to release their retained lists – meaning there are plenty of players available for free!
But it could be an area which might be of interest to the Blues this summer.
We’ve identified six players who were released at the end of the season by League One clubs who Mousinho could look at recruiting in the transfer window.
5. Connor Ripley
The goalkeeper spent one season at Morecambe but fell victim to Derek Adams’ wholesale clearance following their relegation to League Two. Ripley put on an outstanding performance at Fratton Park in April - making a number of stops to keep the scores level and deny the Blues. With Pompey potentially looking at two new keepers this summer - should Oluwayemi depart on loan - the 30-year-old could be the ideal number two on a free. Photo: David Rogers
6. Lewis Wing
The midfielder was another to be on Cowley’s wish-list during his time at Fratton and was tipped with a deadline-day move in January 2022. Wing’s last action with Wycombe was to score a spectacular goal from the halfway line against Pompey on the final day. The 28-year-old netted nine goals and registered six assists from the centre of midfield last season. Mousinho is keen to add creativity and a progressive number eight and he could be the solution. Photo: Catherine Ivill
7. Harvey Knibbs
The versatile forward was wanted by Danny Cowley 12-months-ago and was another player to be released by Cambridge. He can operate both as a number 10 and on the wing and offers plenty of creative threat. Last term in a struggling U’s side, he produced five goals and five assists in League One. In comparison, Joe Pigott - who operated just behind Bishop in a similar role - scored four goals and registered three assists. Photo: Harriet Lander