Nottingham Forest owner Evangelos Marinakis has reportedly been charged with drug trafficking.
On Friday, Greek public prosecutor Eirini Tziva accused the shipowner businessman of what were described as "very serious charges", according to The Guardian.
Marinakis was also charged with financing an illegal operation, and three of his close associates were named with him on the charge sheet, the newspaper has claimed.
The charges are believed to follow a three-year investigation into the Noor 1, a tanker intercepted in the port of Piraeus carrying 2.1 tonnes of heroin in 2014.
Marinakis, who also owns Olympiacos, said in a statement on the Greek club's website: "I have never had anything to do with the acts for which an investigative inquiry is to be conducted, the result of which I am absolutely certain to be the confirmation of my innocence."
The businessman, who bought the Championship side in May 2017, is also facing trial after being accused of trying to fix football matches in Greece.
Forest and the English Football League have not yet commented on the reports.
