Ireland's tour to Australia in July will not go ahead as scheduled following the postponement of all international fixtures by World Rugby.
Andy Farrell's side had been due to face the Wallabies in two Tests on 4 and 11 July at Brisbane's Suncorp Stadium and Sydney's Cricket Ground respectively.
In a statement, IRFU performance director David Nucifora said: "While it is disappointing that the summer tour to Australia will not go ahead as scheduled, it will not be a surprise to many as it is clear that COVID-19 will have implications for our game for some time to come.
"We continue to work with World Rugby, our fellow unions and our players and their representative body, Rugby Players Ireland, to develop a road-map for the return of our game."
World Rugby had confirmed the postponement of all international fixtures scheduled for this summer due to the effects of the coronavirus pandemic.
"The programme of international rugby matches scheduled for the 2020 July window has been postponed due to ongoing government and health agency COVID-19 directives," the sport's governing body announced.
"Extended travel and quarantine restrictions that apply to numerous countries, and concerns over adequate player preparation time, mean that any sort of cross-border international rugby competition cannot be hosted in July.
"Monitoring of the potential impact on the remaining 2020 international windows continues in full collaboration with international rugby stakeholders and the respective authorities. All parties, including member unions, international competitions, professional club competitions and International Rugby Players, will be involved in the continued evaluation of potential contingency options with a view to achieving an aligned calendar for the remainder of the year.
"All decision-making will be entirely contingent on national government travel, quarantine and health advice and important player welfare and hosting considerations in line with return-to-rugby guidance recently published by World Rugby."
As well as Ireland's planned fixtures, Wales were due to be playing a test in Japan at the end of June before moving on to New Zealand, while Scotland were headed for South Africa and England had been scheduled to tour Japan.
"While we are of course disappointed to have our two Test matches against Japan postponed, it's the correct decision under the current circumstances," said England head coach Eddie Jones.
Wales counterpart Wayne Pivac added: "We were very much looking forward to playing both in Japan and New Zealand in the summer so this postponement is disappointing but completely understandable in the circumstances.
"Having seen first-hand the welcome the team received at the World Cup in Japan, and the extraordinary scenes at the open training session, I am sure our fantastic relationship with Japanese rugby will go from strength to strength in the future.
"On a personal note I was really looking forward to returning to New Zealand with Wales. It's unfortunate that we will now have to wait a little longer for that privilege, but the occasion will be no less relished when it arrives."