Tottenham's Europa Conference League clash with Rennes is off.
Eight players and five members of staff have tested positive for Covid-19 from Spurs.
Their match against Brighton on Sunday in the Premier League is also under review.
Speaking earlier on Wednesday, Spurs manager Antonio Conte said: "Now, for sure, we are a bit scared because tomorrow we don't know what happens.
"Every day, we are having more positives. This is not a good situation.
"To speak about football today is impossible. The last situation made me very upset.
"The situation is serious. There is a big infection."