Authorities investigated ‌allegations about classification of referees and their assignments, scoring and ‌appointment procedures and officiating rule ⁠tests, Gurlek ‌said on X.

Ferhat Gundogdu, chairman of ​the Turkish Football Federation's central referee board, was ​detained, he added.

"We will resolutely continue our fight for clean football ⁠to shed ​light on allegations that undermine confidence in Turkish football," Gurlek said.

He vowed to ensure those responsible ‌were held accountable, so as to ensure football is associated with the effort, competition and sportsmanship displayed on the pitch.

There was no immediate response to a Reuters request for comment from representatives of Gundogdu via ‌the referee board.

Investigators took statements ​from complainants and witnesses, sought ‌expert reports, and examined telecom records and financial data from Turkey's financial crimes watchdog MASAK, the minister added.