the reason is that on monday 8 players of the ukrainian national team already tested positive for covid-19 and today another 4 persons (among them 3 players) tested positive for corona.
https://www.kicker.de/uefa-sagt-partie-zwischen-schweiz-und-der-ukraine-ab-789948/artikel
funny,funny. against germany all were not infected and the latest tests are then positive. that's a joke.in the game against germany only 4 were infected .
and today many more. hopefully not so many german players got infected with the corona vorus
all matches should be cancelled and only the important national matches should take place