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...
17. Tony Pullen, Ernie Greenham and Seagull Sam
Tony Pullen, aged 55 from Emsworth, Ernie Greenham, aged 63 from Portchester, and Seagull Sam, aged 65 from Fareham, at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None
18. Calum Roberts and Keith Roberts
Calum Roberts, aged 18 from Waterlooville, and Keith Roberts, aged 45 from Waterlooville, at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None
19. Judy Yoxall, Fiona Kerr, Meg Argyle, Paul Banks, Paul Crage, Barrington Bain, Paul Argyle and Jon Cheeseman
Judy Yoxall, Fiona Kerr, Meg Argyle, Paul Banks, Paul Crage, Barrington Bain, Paul Argyle and Jon Cheeseman at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None
20. Open training at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia
More than 50 Pompey supporters attended an open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia, on Thursday morning. Photo: None