Ayutthaya United (Thai Premier League): every transfer in and out, fees paid and earned, squad market value and €50k earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-08-20 | Kerim Palić | Madura United | Ayutthaya United | Free |
| 2026-08-02 | Player | Ayutthaya United | Chiangmai | Free |
| 2026-07-23 | Sung-dong Paik | Ayutthaya United | Cheongju | Free |
| 2026-07-22 | Hirotaka Mita | Nakhonratchasima Mazda FC | Ayutthaya United | Free |
| 2026-07-22 | Songkhramsamut Namphueng | Police Tero FC | Ayutthaya United | Free |
| 2026-07-22 | Willen Mota | Lamphun Warrior | Ayutthaya United | Free |
| 2026-07-22 | Siriwat Ingkaew | Khonkaen United | Ayutthaya United | Free |
| 2026-07-22 | Chinngoen Phutonyong | Singha Chiangrai United | Ayutthaya United | Free |
| 2026-07-22 | Lucas Dias | Life Sihanoukville | Ayutthaya United | Free |
| 2026-07-22 | Dejan Kerkez | Posusje | Ayutthaya United | Free |
| 2026-07-22 | Sarayut Sompim | Police Tero FC | Ayutthaya United | Free |
| 2026-07-22 | Pichitchai Sienkrathok | Port FC | Ayutthaya United | Loan |
| 2026-07-22 | Chanukan Karin | Port FC | Ayutthaya United | Loan |
| 2026-07-22 | Ewerton | Kanchanaburi | Ayutthaya United | Free |
| 2026-07-22 | Chukid Wanpraphao | True Bangkok United | Ayutthaya United | Loan |
| 2026-07-22 | Warinthon Jamnongwat | BG Pathum United | Ayutthaya United | Loan |
| 2026-07-22 | Passakorn Biaothungoi | True Bangkok United | Ayutthaya United | Loan |
| 2026-07-22 | Wellington Priori | Ayutthaya United | Chonburi FC | Free |
| 2026-07-22 | Player | Ayutthaya United | Banbueng City | Free |
| 2026-07-22 | Narongsak Naengwongsa | Ayutthaya United | Sukhothai | Free |