Singapore police said today that 51-year-old Tan, also known as Tan Seet Eng, was arrested yesterday for "involvement in criminal activities."
He was previously released from jail today when the country's highest court ruled he was being held unlawfully.
"The police confirmed that they have arrested Dan Tan on December 1 for investigations into suspected involvement in criminal activities. Investigations are ongoing," the police statement said.
Hamidul Haq, one of Tan's Lawyers, told The Associated Press he was yet to learn of the specific charges relating to the new arrest.
Tan was jailed in 2013 after Italian prosecutors accused him of being the mastermind of a global crime syndicate that made millions of dollars betting on rigged Italian matches and other games across the world.
He was held under a law that allows for indefinite detention without trial if it's in the interest of public safety, but the Singapore Court of Appeal on November 25 ruled that public safety was not at risk and ordered Tan's release.
Tan was suspected of being the mastermind behind dozens of fixed matches in Italy's top three divisions and leading a fixing ring stretching as far as South America that was allegedly in operation for more than 10 years.
He is also being tried in absentia by a Hungarian court for allegedly manipulating 32 games in Hungary, Italy and Finland.
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