Sagan Tosu: every transfer in and out, fees paid and earned, squad market value and €7m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-02-01 | Hikaru Nakahara | Sagan Tosu | Shimizu S-Pulse | — |
| 2026-02-01 | Fuchi Honda | Sagan Tosu | Kyoto Sanga | Loan |
| 2026-01-16 | Yoon-sung Lee | Sagan Tosu | Gwangju FC | Free |
| 2026-01-16 | Shion Shinkawa | Sagan Tosu | Sint-Truiden | €700k |
| 2026-01-16 | Kento Nishiya | Sagan Tosu | Pohang Steelers | Loan |
| 2026-01-12 | Taisei Inoue | Sagan Tosu | Yokohama F. M. | — |
| 2026-01-12 | Marcelo Ryan | Sagan Tosu | FC Tokyo | — |
| 2026-01-12 | Haruki Arai | Sagan Tosu | Kyoto Sanga | — |
| 2025-08-05 | Yasuki Kimoto | FC Tokyo | Sagan Tosu | Loan |
| 2025-07-01 | Shion Shinkawa | Sagan U18 | Sagan Tosu | — |
| 2025-02-01 | Yoon-sung Lee | Sagan Tosu | Yokohama SCC | Loan |
| 2025-02-01 | Taisei Inoue | Juntendo Univ. | Sagan Tosu | Free |
| 2025-02-01 | Marcelo Ryan | Sagan Tosu | FC Tokyo | Loan |
| 2025-02-01 | Jun Nishikawa | Cerezo Osaka | Sagan Tosu | Loan |
| 2025-02-01 | Hikaru Nakahara | Sagan Tosu | Shimizu S-Pulse | Loan |
| 2025-01-31 | Cayman Togashi | Sagan Tosu | Atlanta | Free |
| 2025-01-20 | Wataru Harada | Sagan Tosu | Kashiwa Reysol | — |
| 2025-01-20 | Tae-hyeon Kim | Sagan Tosu | Kashima Antlers | — |
| 2025-01-20 | Il-gyu Park | Sagan Tosu | Yokohama F. M. | — |
| 2025-01-20 | Haruki Arai | Mito HollyHock | Sagan Tosu | — |