Evangelos Marinakis, the owner of Championship side Nottingham Forest and Greek giants Olympiacos, confirmed Tuesday that he's tested positive for COVID-19, the disease caused by the new coronavirus.

"The recent virus has visited me and I felt obliged to let the public know," Marinakis said in an Instagram post.

"I feel good, as I take all the necessary measures and I discipline to the doctors' instructions. I strongly advise all my fellow citizens to do the same. I wish all a quick recovery."

In a statement, Nottingham Forest revealed that Marinakis - who was present at the team's home stadium, City Ground, last Friday - began to show symptoms on Monday afternoon in Greece.

"Mr. Marinakis was diagnosed after showing the first symptoms on his return to Greece yesterday afternoon. During his short stay in Nottingham last week he did not show any symptoms of the virus," the statement read.

"The club is seeking advice from medical professionals and the relevant governing bodies to ensure the correct measures are taken. Until this time the club will be making no further comment."

The 52-year-old Marinakis was also present at the Emirates Stadium in north London on Feb. 27 to watch Olympiacos knock Arsenal out of the Europa League. It's understood that he was seen in the dressing rooms, directors box and on the pitch throughout the evening.

Arsenal issued a statement Tuesday, which claimed that staff members who came into contact with Marinakis have not reported any symptoms.

"We continue to follow strict protocols with regard to coronavirus," Arsenal said, via Charles Watts of Goal. "We’re following the government health guidelines and have additional rocedures in place to protect our players and staff. This has included regular deep cleaning of areas used by players at Emirates Stadium and our training center."

It's unclear if Thursday's Europa League fixture between Olympiacos and Wolverhampton Wanderers in Greece, which is set to be played behind closed doors, will go ahead following the news of Marinakis' diagnosis.