Last week, prosecutors ordered the detention of 46 people, including players, club presidents, commentators and a referee, over insider betting in Turkey's professional leagues.
State-run Anadolu said that among those detained in that operation, Galatasaray player Metehan Baltaci and Fenerbahce player Mert Hakan Yandas, as well as former Adana Demirspor president Murat Sancak, were now formally arrested and jailed.
The scale of the current investigation is comparable with previous probes into match gambling and match fixing in past decades in China, South Korea, Italy and other European countries.
'Crimes covered up'
"For years, the problems of Turkish football have been swept under the carpet," Turkish Football Federation Chairman Ibrahim Haciosmanoglu told a press conference.
"Such disgraceful decisions have been made, such crimes covered up, and the sole responsibility for our current situation is a lack of will."
He indicated that the federation’s investigation could widen once it has received data from Turkey’s state-run sports betting organisation Spor Toto regarding match observers, coaches, managers and others involved in football.
"The data hasn't yet arrived. We want the public to know that we will take appropriate action when it does," he said.
At a hearing on Monday, Baltaci told the court that he had placed bets on a few matches when he was a youth team player and had not done so after he joined the Galatasaray first team, according to Anadolu news agency.
Fenerbahce’s Yandas was cited by Sabah newspaper as saying in his court testimony that he denied involvement in gambling on matches.
Sancak told the court he did not have a gambling account and had never placed a bet on matches, Cumhuriyet newspaper said.
Representatives of the two players and the former club official could not immediately be reached for comment.
Last month, Turkey's football federation suspended 149 referees and assistants after an investigation found that officials in the professional leagues were betting on games.
The net then widened with the arrest of eight people, including the chairman of a top-tier club, and the suspension of 1,024 players from all leagues, on whom the federation (TFF) imposed bans.
A trial date has not yet been set.
