MKS Polonia U19: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2022-07-01 | Jan Ziolkowski | MKS Polonia U19 | Legia U19 | — |
| 2021-07-01 | Krzysztof Koton | MKS Polonia U19 | Pol. Warsaw | — |
| 2018-07-01 | Michael Ameyaw | MKS Polonia U19 | Widzew Lodz | Free |
| 2018-02-09 | Filip Majchrowicz | MKS Polonia U19 | Cracovia | — |
| 2017-07-01 | Michał Kaput | MKS Polonia U19 | LKS Lomza | Free |
| 2016-07-01 | Filip Majchrowicz | Stomil U19 | MKS Polonia U19 | Free |
| 2013-01-26 | Maksymilian Stryjek | MKS Polonia U19 | Sunderland U18 | — |
| 2012-08-01 | Jan Grzesik | MKS Polonia U19 | Legia U19 | — |