Edit: Police also confirmed that all individuals who were taken into custody are being held as suspects, not witnesses.
A total of 24 individuals have been taken into custody, ranging from club executives, player agents, referees and a former attorney to jewelers and a few journalists.
Mogi Bayat has been arrested and will presumably be indicted. He's the top player agent in Belgian football and has a strong influence at pretty much every club. Almost all transfers from our league go through him. He became an agent roughly 8 years ago and now handles 90% (no exaggeration) of transfers within and from the Belgian Pro League.
One of the clubs that got raided said that the police were confiscating all records on Bayat.
One of the allegations against Bayat claims he was able to somehow acquire and sell loads of players whose clubs found it almost impossible to get rid of them due to lack of interest or price demands. He repeatedly managed to swoop in and get a good deal that was satisfactory to both the player and selling club. Those particular transfers often went to the same handful of clubs such as Udinese.
The Club Brugge manager was taken into custody for interrogation early this morning (GMT+2) and is still being interrogated as far as we know.
Edit: It's confirmed he will spend at least tonight in jail.
One of the referees in custody was supposed to oversee a Nations League match this weekend between Georgia and Andorra. UEFA has taken swift action and replaced him.
The foreign search warrants as part of the investigation took place in France, Luxembourg, Montenegro, Serbia and Macedonia. Serbian authorities confiscated €800.000 in cash from 6 properties, allegedly from suspicious transfers.
Another agent, Christophe Henrotay, is confirmed to be under criminal investigation as well, though not specifically related to the larger corruption, money laundering and match fixing investigation. He's accused of withholding millions of euros in foreign shell company constructions off transfers from players like Lukaku and Youri Tielemans.
He's also Thibaut Courtois' current agent.
A professional trainer who worked with Henrotay filed a criminal complaint against him, which resulted in the current investigation against him.