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...
1. Andrew Barnard, Reece Hawkins, Tom Chappell and Gaz Guinness
Andrew Barnard, Reece Hawkins, Tom Chappell and Gaz Guinness at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None
2. Andy Fleet, Lewis Boyd and Len Lock
Andy Fleet, aged 38 from Hilsea, Lewis Boyd, aged 38 from Cosham, and Len Lock, aged 38 from Portchester, at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None
3. Kieran Le Manquais, Faris Al Khalo, Jack Cobb, Sam Ward and Harvey Waltho
Kieran Le Manquais, aged 21 from Worthing, Faris Al Khalo, aged 22 from Bahrain, Jack Cobb, aged 22 from Anchorage Park, Sam Ward, aged 20 from Stamshaw, and Harvey Waltho, aged 20 from Fratton, at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None
4. Kymberly Gooding, Isabelle Gooding and Josh Scott
Kymberly Gooding, aged 16 from Locks Heath, Isabelle Gooding aged 15 from Locks Heath, and Josh Scott, aged 20 from Paulsgrove at Pompey's open training session at the X-Bionic Sphere Sports Centre in Šamorín, Slovakia. Photo: None