The scandal initially hit the headlines on 27 October, when TFF president Ibrahim Haciosmanoglu said hundreds of referees were linked to betting accounts.

Haciosmanoglu claimed that out of 571 referees working in Turkey’s professional leagues, 371 had betting accounts and 152 were actively placing wagers.

He said the group included seven referees and 15 assistant referees from Turkey’s top two divisions, as well as 36 “classified” referees and 94 assistants from the level below.

The TFF president added that 10 referees each placed more than 10,000 bets. One referee placed 18,227, while 142 referees placed bets on more than 1,000 matches. Some referees only placed a single bet.

Like players and coaches, match officials are forbidden from participating in betting activities by TFF regulations, as well as those of Fifa and European governing body Uefa.

Turkish prosecutors recently issued detention orders for 21 people – including 17 referees and two football club presidents – as part of a major investigation into betting and match fixing.