Sagan U18: every transfer in and out, fees paid and earned, squad market value and €400k earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-07-01 | Shion Shinkawa | Sagan U18 | Sagan Tosu | — |
| 2023-01-01 | Taichi Fukui | Sagan U18 | FC Bayern II | €400k |
| 2021-07-30 | Shinya Nakano | Sagan U18 | Sagan Tosu | — |
| 2021-06-30 | Rio Nitta | Sagan U18 | Sagan Tosu | — |
| 2021-04-01 | Yu Hashimoto | Sagan U18 | Fukuoka Univ. | Free |
| 2021-04-01 | Kodai Nagata | Sagan U18 | Meiji Uni | Free |
| 2020-04-01 | Taichi Fukui | Sagan Jg | Sagan U18 | — |
| 2020-02-01 | Fuchi Honda | Sagan U18 | Sagan Tosu | — |
| 2020-02-01 | Ayumu Ohata | Sagan U18 | Sagan Tosu | — |
| 2019-04-01 | Kotaro Hayashi | Sagan U18 | Meiji Uni | Free |
| 2017-02-01 | Kyosuke Tagawa | Sagan U18 | Sagan Tosu | — |
| 2015-04-01 | Yuta Higuchi | Sagan U18 | N.I.F.S. Kanoya | Free |