| nickname(s) |  Krzyżu |
| position(s) | Defender (Central) |
| preferred foot | - |
| height [cm] • weight [kg] | 186 • 83 |
| date of birth [dd/mm/yyyy] | 24/01/2002 |
| place of birth |  Częstochowa |
| nationality(ies) | Polish |
| • 30/05/2023 Men's Under 21s: Squad selected for friendlies against Finland and Montenegro |
| • 12/09/2022 Men's Under 21s: Players from Polish clubs have been added to the squad for friendlies against Greece and Latvia |
| • 16/05/2022 Men's Under 20s: Squad selected for training camp in Uniejów (30 May - 1 Jun) |
| • 31/08/2021 Men's Under 20s: Bartosz Guzdek and Oskar Krzyżak have been added to the squad for Elite League matches against Italy and Portugal |
| • 29/09/2020 Men's Under 19s: Players from Polish clubs have been added to the squad for friendlies against Denmark |
| • 29/10/2018 Men's Under 17s: Squad selected for training camp |
| • 23/10/2018 Men's Under 17s: Oskar Krzyżak has replaced injured Patryk Peda in the squad for 2019 UEFA Under 17 Championship Qualifying Round |
| • 21/07/2018 Men's Under 17s: Squad selected for training camp in Sieraków (5 Aug - 10 Aug) |