The former chairman of Larissa soccer club, Costas Piladakis, was arrested on Thursday in connection to debts that have allegedly been run up by two companies that he owns.
Police said the debt to the state amounted to 4 million euros.
The 48-year-old was taken to a prosecutor after he was arrested in Glyfada, southern Athens.
He was one of four people arrested in Athens over unpaid taxes on Thursday.
The other three were a 69-year-old managing director who owes 2.4 million euros, a 55-year-old with debts of 362,000 euros and a 54-year-old who has not paid some 360,000 euros in tax.