Ukraine on Tuesday accused 35 football clubs of being involved in a match fixing operation that earned organisers millions of dollars a year.
Police said two-thirds of all teams, including some in the top division, took part. Neither perennial champions Dynamo Kyiv nor Shakhtar Donetsk were named.
"Club presidents, former and current players, referees, trainers and commercial organisations were involved," Interior Minister Arsen Avakov wrote on Facebook.
"In total, we have documented the involvement of 320 individuals in 57 proven cases."
Avakov said organisers earned up to $5 million (4.2 million euros) by making bets in Asia on pre-determined results of Ukrainian matches.
Ukraine's deputy police chief Igor Kupranets separately told reporters that no arrests had been made.
Kupranets added that prosecutors would decide whether and when to bring charges against the suspects.
The announcement came as the football world's attention zeroes in on the Ukrainian capital Kiev ahead of Saturday's Champions League final between Liverpool and Real Madrid.
Ukraine failed to make next month's World Cup in Russia after finishing third in its qualification group.