The opening two days involve medical and physical testing, with the team coming together for full training on Thursday morning at their Hilsea training base.
We’ve dipped into the picture archives to look at first days of Pompey pre-season training from the past, with a host of familiar faces in action.
Hope you enjoy the trip down memory lane far more than those players partaking in them...
17. June 2022
Dan Gifford in pre-season training under Danny Cowley in June 2022. Picture: Habibur Rahman Photo: Habibur Rahman
18. July 2009
Younes Kaboul, Angelos Basinas, Richard Hughes and Niko Kranjcar on Pompey's first day of training working with Paul Groves at Eastleigh in July 2009. Picture: Will Caddy 092513-2 Photo: Will Caddy
19. June 2019
Lee Brown, Paul Downing and Louis Dennis among the Pompey players at pre-season training in June 2019. Picture: Habibur Rahman Photo: habibur rahman
20. June 2019
Anton Walkes, Ben Close and triallist Aaron Jarvis at training in June 2019. Picture: Habibur Rahman Photo: Habibur Rahman