Nottingham Forest majority owner Evangelos Marinakis has announced he has contracted coronavirus.
The Greek businessman - also owner of Olympiacos, who are due to play Wolves behind closed doors in the Europa League on Thursday - attended Friday night's Sky Bet Championship match against Millwall, where he reportedly met with the first-team squad.
He revealed on Instagram on Tuesday morning that he was now following the advice of doctors regarding self-isolation.
Marinakis said: "The recent virus has 'visited' me and I felt obliged to let the public know.
"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."
It is understood an initial discussion has taken place between Forest and the English Football League, and that those conversations will continue throughout the day to ascertain what the situation is.
As of Tuesday afternoon, Greek Super League leaders Olympiacos were still planning on hosting Thursday's last-16 first-leg tie against Wolves, the PA news agency understands.
The Greek government has enforced a two-week suspension of spectators attending sporting events due to the outbreak of Covid-19, with the game due to be played behind closed doors.