With wage levels expected to drop as a consequence, clubs are also expected to struggle to retain some of their best players, with some eye-catching performers potentially up for grabs.
We’ve contacted local journalists covering League One to compile a list of each club’s free agents this summer – and here are the prominent names which may well interest Pompey...
1. Gavin Massey (winger)
The 28-year-old has endured an injury-hampered season but has proven an excellent performer for Wigan. After being a pivotal presence in their title-winning side of 2017-18, he has established himself as a talented play at Championship level. Picture by Nathan Stirk/Getty Images Photo: Nathan Stirk
2. Siriki Dembele (winger/forward)
A highly sought-after attacker, Dembele is one of League One's outstanding players with his pace and trickery. Although out of contract in the summer, Peterborough still possess an option and will keen to retain his services - although expect admirers to also intervene. Picture: Nathan Stirk/Getty Images Photo: Nathan Stirk
3. Lee Evans (central midfielder)
The Welsh international was handed his chance at Wolves by Kenny Jackett and went on to earn a £750,000 switch to Sheffield United before arriving at Wigan. The 26-year-old has made more than 100 appearances for the Latics, including during their League One title-winning campaign. Picture: Alex Burstow/Getty Images Photo: Alex Burstow
4. Luke O'Nien (midfield/defence)
A highly-versatile player with exceptional energy levels and battling qualities, the 26-year-old has been a regular in Sunderland's team for three seasons. O'Nien can play midfield, right-back and even centre-half, while is regarded as one of Sunderland's stars of this season. Picture: George Wood/Getty Images Photo: George Wood