Tánaiste Leo Varadkar has cast doubt on Dublin being able to host any Euro 2020 games if UEFA insist on stadiums being 25% full for the tournament.
June's delayed European Championship is due to be hosted in 12 cities across the continent for the first time and UEFA is set to decide on Friday what to do with Munich, Bilbao and Dublin, which have been unable to guarantee spectator attendance.
The Aviva Stadium is scheduled to host three group games and a last-16 tie but with Ireland still under Level 5 Covid-19 restrictions and reopening expected to proceed slowly, the Tánaiste said it would be "too soon" to allow over 12,000 supporters at a time attend games there.
"We're just very cautious about that, we just think June is too soon," he told Today FM.
"I think if they continue to insist on that (having 25% of the stadium full), it'll be hard for it to go ahead quite frankly, which is unfortunate."
Ticket buyers for the matches in Bilbao, Dublin and Munich will be able to return their tickets until Monday 26 April through the UEFA website.