| • 05/03/2021 Men's Under 21s: Squad selected for friendlies against Saudi Arabia and Austria |
| # | pos | name | club |
| G |  Xavier Dziekoński |
 Jagiellonia Białystok |
|
| G | Cezary Miszta |
Legia Warszawa |
|
| G | Jakub Stolarczyk |  Leicester City |
|
| D |  Łukasz Bejger |
Śląsk Wrocław |
|
| D | Marcin Grabowski |
Bruk-Bet Termalica Nieciecza |
|
| D | Michał Karbownik |
Brighton & Hove Albion |
|
| D | Jakub Kiwior |  MŠK Žilina |
|
| D | Kamil Kruk |
Zagłębie Lubin |
|
| D | Maik Nawrocki |
Warta Poznań |
|
| D | Aleksander Paluszek |
Górnik Zabrze |
|
| D |  Patryk Peda |
 SPAL |
|
| D | Wiktor Pleśnierowicz |
Miedź Legnica |
|
| D | Sebastian Walukiewicz |
Cagliari |
|
| M | Jan Biegański |
Lechia Gdańsk |
|
| M | Mateusz Bogusz |  Logroñés |
|
| M | Jakub Kamiński |
Lech Poznań |
|
| M | Krzysztof Kubica |
Górnik Zabrze |
|
| M | Mateusz Łęgowski |
Pogoń Szczecin |
|
| M | Filip Marchwiński |
Lech Poznań |
|
| M | Mateusz Praszelik |
Śląsk Wrocław |
|
| M |  Michał Skóraś |
Lech Poznań |
|
| M | Kacper Smoliński |
Pogoń Szczecin |
|
| M | Daniel Szelągowski |
Raków Częstochowa |
|
| M | Maciej Żurawski |
Warta Poznań |
|
| F | Adrian Benedyczak |
Pogoń Szczecin |
|
| F | Bartosz Białek |  VfL Wolfsburg |
|
| F | Dawid Kocyła |
Wisła Płock |
|
| F | Filip Szymczak |
Lech Poznań |
| Squad update: |
| • 24/03/2021 Men's Under 21s: Michał Skóraś has been withdrawn from the squad for friendlies against Saudi Arabia and Austria |
| • 21/03/2021 Men's Under 21s: Wiktor Pleśnierowicz has replaced injured Łukasz Bejger in the squad for friendlies against Saudi Arabia and Austria |
| • 17/03/2021 Men's Under 21s: Patryk Peda has been released from the squad for friendlies against Saudi Arabia and Austria |
| • 17/03/2021 Men's Under 21s: Michał Karbownik and Sebastian Walukiewicz have been added to the squad for friendlies against Saudi Arabia and Austria |
| • 17/03/2021 Men's Under 21s: Players from Polish clubs have been added to the squad for friendlies against Saudi Arabia and Austria |