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Everton's entire first-team squad and coaching staff are in self-isolation after a player showed symptoms of the coronavirus.
The club posted the following message on Twitter on Friday:
The decision means there is now serious doubt as to whether Monday's Premier League clash with local rivals Liverpool will go ahead.
Paul Joyce of The Times provided further details, noting a number of the club's facilities, including Goodison Park, have been closed:
On Thursday, Arsenal announced that their manager, Mikel Arteta, had tested positive for the virus, while Chelsea confirmed in the early hours of Friday morning that winger Callum Hudson-Odoi had COVID-19.