The Europa League ties between Sevilla and Roma in Spain and Inter Milan's against Getafe in Italy have been postponed because of coronavirus.
Both last-16 first-leg games were due to be played behind closed doors on Thursday but have been called off after Spanish authorities imposed travel restrictions between Spain and Italy.
Uefa said it will communicate further decisions on both games in due course.
Roma had already said they would not be travelling to Seville.
Getafe president Angel Torres earlier said his club were refusing to travel to Italy for the game, even if it meant they were kicked out of the competition.