UEFA refers canceled games to its disciplinary panel for a verdict. It can order Ukraine to forfeit the game as part of emergency competition rules during the coronavirus pandemic.
Those rules require national teams to play if they have 13 eligible players, including one specialist goalkeeper, on site who are not isolating in quarantine and have tested negative.
It is the second Nations League cancellation in the current international break due to public restrictions to control the pandemic. Norway was unable to send a team to fulfill a fixture in Romania on Sunday.
The match Tuesday was to have decided which of Switzerland or Ukraine is relegated to the Nations League second tier from a group that also includes Germany and Spain.
Ukrainian team officials had suggested two of the six players in question should have been given UEFA clearance to play. The federation said Sergei Kryvtsov and Junior Moraes had antibodies after previously testing positive for COVID-19 while on Champions League duty with Shakhtar Donetsk.
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