Sagan Tosu (J2-League): every transfer in and out, fees paid and earned, squad market value, €570k spent and €2m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-23 | Jô | Sagan Tosu | Kanchanaburi | Free |
| 2026-07-06 | Vykintas Slivka | Sagan Tosu | Kauno Žalgiris | Free |
| 2026-07-02 | Park Ho-min | Incheon United Football Club | Sagan Tosu | Free |
| 2026-07-01 | Manato Yoshida | Oita Trinita | Sagan Tosu | Free |
| 2026-07-01 | Hikaru Nakahara | S-Pulse | Sagan Tosu | Free |
| 2026-07-01 | Toshiki Takahashi | S-Pulse | Sagan Tosu | Free |
| 2026-07-01 | Kaito Abe | Fagiano Okayama Sports Club | Sagan Tosu | Free |
| 2026-07-01 | Kakeru Yamauchi | Rakuten Vissel Kobe | Sagan Tosu | Loan |
| 2026-07-01 | Kenshin Yuba | Sagan Tosu | Hitachi Kashiwa Reysol | Free |
| 2026-07-01 | Fuchi Honda | Sagan Tosu | Kyoto Purple Sanga | Free |
| 2026-07-01 | Kei Uchiyama | Sagan Tosu | Renofa Yamaguchi | Free |
| 2026-07-01 | Fumiya Kitajima | Sagan Tosu | Gifu | Loan |
| 2026-02-01 | Tatsunori Sakurai | Rakuten Vissel Kobe | Sagan Tosu | Free |
| 2026-02-01 | Sota Matsubara | JEF United | Sagan Tosu | Free |
| 2026-02-01 | Yudai Tanaka | Fagiano Okayama Sports Club | Sagan Tosu | Free |
| 2026-02-01 | Nagi Matsumoto | Cerezo Osaka | Sagan Tosu | Free |
| 2026-02-01 | Dai Hirase | Sagan Tosu | Gifu | Free |
| 2026-02-01 | Ryonosuke Kabayama | Sagan Tosu | Ehime | Free |
| 2026-02-01 | Yuki Horigome | Sagan Tosu | Consadole Sapporo | Free |
| 2026-02-01 | Fuchi Honda | Sagan Tosu | Kyoto Purple Sanga | Loan |