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...
13. Marek Beno, Kristian Slahor and Laco Horvat
Marek Beno, from Bratislava, Kristian Slahor, from Bratislava, and Laco Horvat, from Bratislava, at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None
14. Gary Bishop and Nolan Bishop
Gary Bishop, aged 57 from Emsworth, and Nolan Bishop, aged 15 from Emsworth, at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None
15. The Pompey players meet supporters
Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None
16. Nina Mulabdic, George Pearce and Melinda Pearce
Nina Mulabdic, aged 26 from Vienna, George Pearce, aged 27 from Vienna, and Melinda Pearce, aged 58 from Vienna, at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None