This means the Blues will be turning their attention to bringing in players aged 24 and under, with the best years of their careers ahead of them, and a profit likely to follow similar to those received for Matt Clarke and Jamal Lowe.
In January, 23-year-old Denver Hume was recruited from Sunderland for a fee in the region of £200k and was one of the first to be brought in under the new policy.
Here, we take a look at the 15 top-ranked under-24-year-old’s from League One and League Two who Pompey could realistically target in the summer from WhoScored’s player ratings.
Here are the options Danny Cowley could be presented with.
A message from the Editor, Mark Waldron
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5. Davis Keillor-Dunn - Oldham Athletic
Position: Attacking midfield Age: 24 Appearances this season: 30 Goals: 10 Assists: 2 Contract: Expires at the end of the season Average Rating: 6.86 Photo: Lewis Storey
6. Anthony Scully - Lincoln City
Position: Right-wing Age: 22 Appearances this season: 24 Goals: 8 Assists: 7 Contract: 18 months remaining Average Rating: 6.86 Photo: George Wood
7. Ethan Hamilton - Accrington Stanley
Position: Centre midfield Age: 23 Appearances this season: 27 Goals: 6 Assists: 0 Contract: 18 months remaining Average Rating: 6.87 Photo: Jacques Feeney
8. Corey O'Keeffe - Rochdale
Position: Right-back Age: 23 Appearances this season: 26 Goals: 1 Assists: 7 Contract: Expires at the end of the season Average Rating: 6.97 Photo: Nathan Stirk