Ireland must fear that UEFA will move the European Championship matches in Dublin.
The country could not guarantee on Wednesday that it will allow spectators to the games.
UEFA has asked the twelve targeted host countries to submit a plan for admitting the public to the European Championship matches by Wednesday at the latest.
On April 20, the association will make a decision on the proposals, but it seems almost impossible in advance that games will be played in empty stadiums.
"We informed UEFA today that given the pandemic, we are not in a position to provide assurance on a minimum number of spectators," Irish association FAI said in a statement.
"We will continue to discuss the situation with UEFA."
In Ireland, about 13 percent of the population is currently vaccinated.
With approximately five hundred new infections per day (for five million inhabitants), the figures are relatively better than in many other European countries, including the Netherlands.
“The state of health in the country is the main concern at the moment,” the FAI nevertheless writes.
"This creates major challenges in organizing the European Championship matches."
Ireland's national team was unable to qualify for the European Championship.
Group duels between Slovenia, Poland and Sweden are planned in Dublin and a game in the eighth finals.
See also: European Championship duels in Amsterdam in principle with at least 12,000 fans
Many other host cities want to admit 25 to 50 percent public
Earlier on Wednesday, the KNVB announced that it plans to fill the Johan Cruijff ArenA for 25 percent during the European Championship.
This means that each of the four duels can be attended by twelve thousand spectators.
Italy, Spain, Denmark, Scotland, Russia and Romania also submitted a plan to UEFA with between 25 and 50 percent filled stadiums.
The plans of Germany, Hungary and Azerbaijan for admitting the public are currently not yet known.
This also applies to England, where, among other things, the semi-finals and the final battle must be played.
It is expected that the Wembley stadium in London can be half filled.
The opening match of the European Championship between Italy and Turkey is scheduled for June 11 in Rome.
The final must be played in London exactly one month later.