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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9. Alex Pattison - Harrogate Town
Position: Centre Midfield Age: 24 Appearances this season: 27 Goals: 8 Assists: 5 Contract: Expires at the end of the season Average Rating: 7.04 Photo: Pete Norton
10. Harry McKirdy - Swindon Town
Position: Striker Age: 24 Appearances this season: 26 Goals: 13 Assists: 7 Contract: Expires at the end of the season Average Rating: 7.07 Photo: Cameron Smith
11. Jack Diamond - Harrogate Town
Position: Left-wing Age: 22 Appearances this season: 23 Goals: 8 Assists: 5 Contract: Expires at the end of the season Average Rating: 7.14 Photo: George Wood
12. Mathew Stevens - Forest Green
Position: Striker Age: 24 Appearances this season: 30 Goals: 20 Assists: 3 Contract: 18 months remaining Average Rating: 7.22 Photo: George Wood