Slavia U18 (): every transfer in and out, fees paid and earned, and the market value of the squad.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2021-07-01 | Martin Georgiev | Slavia U18 | Slavia Sofia | — |
| 2018-07-01 | Filip Krastev | Slavia U18 | Slavia Sofia | — |
| 2014-07-01 | Yanis Karabelyov | Slavia U18 | Slavia Sofia | — |
| 2013-07-01 | Stefan Velkov | Slavia U18 | Slavia Sofia | — |