Polonia Warsaw (I liga): every transfer in and out, fees paid and earned, squad market value, €5k spent.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-16 | Jakub Budnicki | Korona Kielce | Polonia Warsaw | Free |
| 2026-07-12 | Mateusz Jeleń | Górnik Zabrze | Polonia Warsaw | Loan |
| 2026-07-08 | Jakub Budnicki | Korona Kielce | Polonia Warsaw | Loan |
| 2026-07-06 | M. Bajdur | Polonia Warsaw | Wigry Suwałki | Free |
| 2026-07-05 | Erion Hoxhallari | Polonia Warsaw | Dinamo City | Free |
| 2026-07-02 | Tomasz Makowski | Zaglebie Lubin | Polonia Warsaw | Free |
| 2026-07-01 | Davíd Kristján Ólafsson | Larissa | Polonia Warsaw | Free |
| 2026-07-01 | Michał Marcjanik | Morski Związkowy Klub Sportowy Arka Gdynia Spółka Akcyjna | Polonia Warsaw | Free |
| 2026-07-01 | Krystian Tabara | Znicz Pruszków | Polonia Warsaw | Free |
| 2026-07-01 | Sebastian Kowalczyk | Zaglebie Lubin | Polonia Warsaw | Free |
| 2026-07-01 | Lukasz Zjawinski | Polonia Warsaw | Legia Warszawa | Free |
| 2026-07-01 | Przemyslaw Szur | Polonia Warsaw | Pogon Siedlce | Free |
| 2026-02-11 | Antoni Klukowski | Widzew Lodz | Polonia Warsaw | Loan |
| 2026-02-08 | Jakub Budnicki | Korona Kielce | Polonia Warsaw | Loan |
| 2026-02-05 | Kacper Spiewak | Polonia Warsaw | Stal Stalowa Wola | Free |
| 2026-01-26 | Kacper Kostorz | Pogon Szczecin | Polonia Warsaw | Free |
| 2026-01-26 | Marek Mróz | Zaglebie Lubin | Polonia Warsaw | Free |
| 2026-01-26 | Hide Vitalucci | Morski Związkowy Klub Sportowy Arka Gdynia Spółka Akcyjna | Polonia Warsaw | Loan |
| 2026-01-26 | Bartlomiej Poczobut | Polonia Warsaw | Pogon Siedlce | Free |
| 2025-09-08 | Aleksander Buksa | Górnik Zabrze | Polonia Warsaw | Loan |