They came from Chichester, Bristol, Vienna and Slovakia to attend the Thursday morning event at the X-Bionic Sphere Sports Centre in Šamorín, with some of those attending only visiting the country for 24 hours.
And after the training session, those in attendance were allowed to meet the players for photographs, autographs and, in some cases, a chat.
John Mousinho and sporting director Rich Hughes also took part as fans appreciated the training access granted by the Blues – and here are photographs of all those present...
9. Christian Bailey and Guy Bailey
Christian Bailey, aged 18 from Bratislava, and Guy Bailey, aged 56 from Bratislava, at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None
10. Josh Mousinho meets the fans
Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None
11. Phil Hancock, Shaun Truman and Ant Cripps
Phil Hancock, aged 41 from Southsea, Shaun Truman, aged 39 from Fratton, and Ant Cripps, aged 45 from Portchester, at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None
12. Ben Sayer
Ben Sayer, aged 25 from Cosham, at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None