UEFA has been told by the Football Association of Ireland and the government that no assurances can be provided on spectators attending Euro 2020 games in Dublin, putting hopes of hosting matches in the country in serious doubt.
The 12 host cities, including Dublin, submitted their plans today on what number of fans could attend matches in their stadiums.
UEFA says that details will be announced following the examination of the submissions.
Football's European governing body UEFA had told RTÉ Sport that it remains committed to holding Euro 2020 according to the timetable already published, that is between the 11 June and 11 July this year.
In a statement, the FAI confirmed they could not give UEFA any guarantees on fans attending.
They said: "The Football Association of Ireland, on advice and guidance from the government, has today notified UEFA that owing to the Covid-19 pandemic it is not in a position at this point to provide assurances on minimum spectator levels at the Euro 2020 matches due to be held in Dublin in June.
"In so doing, we have advised UEFA that the matter will be kept under review and that the Local Organising Structure (LOS) team including government will continue to discuss all issues with UEFA on an ongoing basis.
"All partners of the LOS – Government, the FAI, Aviva Stadium and Dublin City Council - recognise the challenges presented by spectator attendance at Aviva Stadium for the scheduled hosting of four matches at Euro 2020 this summer and that public health issues are the most important consideration in the organisation of the project."
FAI chief executive Jonathan Hill said they will now leave the decision with UEFA: "We have made our submission to UEFA today and now await their response once submissions from all 12 host cities have been received and considered."
The government and the FAI are keen to retain the hosting rights but today's submission leaves Ireland up against it in trying to keep the games.
With the prospect of spectators attending unclear, and the Irish team not featuring at the tournament, UEFA could consider moving the games to another city with a better outlook for fans attending.
Ireland missed out on a place at the tournament following defeat to Slovakia in a play-off semi-final last October.
A decision is expected before UEFA's executive meets on 19 April.
Ahead of today's deadline, it was confirmed the Johan Cruyff ArenA in Amsterdam would see at least 12,000 supporters attend under current proposals and that at least 11,000 supporters are expected to be able to attend the four Euro 2020 games in the Danish capital Copenhagen. Scotland and Spain have made similar promises.
The Italian Football Federation said it had been told by the government that Rome's Stadio Olimpico would be able to welcome spectators for Euro 2020 while there could also be up to 50% capacity at matches in St Petersburg, Russia, which will host one of the quarter-finals as well as group matches.
A no-guarantee approach from the Irish bid means the three group games scheduled for the Aviva, involving Poland, Sweden and Slovakia, as well as one Round of 16 match, are likely to go elsewhere.
We need your consent to load this SoundCloud contentWe use SoundCloud to manage extra content that can set cookies on your device and collect data about your activity. Please review their details and accept them to load the content.Manage Preferences