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.
Elsewhere, the Republic of Ireland's Euro 2020 play-off semi-final in Slovakia will now be played behind closed doors.
The Slovakian football association (SFZ) has confirmed that no spectators will be allowed into the game in Bratislava on March 26.
A statement on the SFZ's website read: "At a meeting of the SFZ executive committee held today (Tuesday, March 10) at the SFZ headquarters in Bratislava, it was decided about the fate of the relegation match for the European Championship against Ireland.
"On the basis of measures taken by the state authorities in connection with the spread of coronavirus, but also communication with the European Football Union UEFA and the Irish side, VV approved the play-off of Slovakia-Ireland without spectators."
The Bosnia and Herzegovina federation has confirmed ticket sales for this month's Euro 2020 play-off match with Northern Ireland, which were set to go on sale on Wednesday, have been suspended.
Manchester United's Europa League match at LASK on Thursday will be played behind closed doors following Austrian government advice.
A post on the club's Twitter account read: "LASK has announced that the home game against @ManUtd scheduled for Thursday must take place without a spectator. The association will provide further information after publication of the relevant decree."
Austrian Bundesliga chairman Christian Ebenbauer told www.oefbl.at: "Of course we all prefer to watch atmospheric games with many spectators, but we are experiencing an exceptional situation across the country.
The French health minister Olivier Veran announced on Sunday evening that all gatherings of more than 1,000 people are now prohibited in the country, meaning Ligue 1 matches must be played behind closed doors or in front of no more than 1,000 spectators.
All domestic sporting action has been suspended in Italy after prime minister Giuseppe Conte announced at a press conference that the whole country would be on lockdown from Tuesday morning.
The country's national Olympic committee (CONI) originally made the announcement on Monday, but CONI's jurisdiction does not cover Italian clubs or national teams involved in international competitions, such as football's Champions League.
