However, only three were kept on by the Blues’ head coach, as the rest were forced to look elsewhere for their next career step.
But who were they?
Here are the players who trained with the Fratton Park outfit in pre-season 12-months-ago.
13. Brandon Mason
The 24-year-old signed for Pompey’s rivals MK Dons last pre-season, but failed to make an appearance for the Dons as they reached the play-offs in May. Picture: Richard Heathcote/Getty Images Photo: Richard Heathcote
14. Dan Gyollai
The Peterborough goalkeeper went on loan to Maidenhead in January 2022 and made 16 appearances for the National League side last term. Picture: David Rogers/Getty Images Photo: David Rogers
15. Ludwig Francillete
The defender signed for League Two Crawley after his Blues trial and became a key figure for the Red Devils. Last season he made 29 appearances and scored once as the club finished 12th. Picture: Pete Norton/Getty Images Photo: Pete Norton
16. Robbie Burton
Burton arrived on the south coast after captaining Arsenal under-23s and playing for Dynamo Zagreb. He returned to Croatia after not being offered a contract with Pompey and was loaned to NK Istra 1961 and then returned to his parent club. In total he made five appearances last term. Picture: David Price/Arsenal FC via Getty Images Photo: David Price