Sporting fixtures all over Ireland could be paused if the government decides to act on a letter it received from the National Public Health Emergency Team (NPHET) on Sunday night.
The letter recommends placing the entire country at Level 5 within the government's "framework for restrictive measures".
This would mean that no matches could take place, while training would only be allowed on an individual basis, as it was back in the spring.
Should such a position be agreed nationwide, then the All-Ireland football and hurling championships, which are scheduled to start later this month, would have to be put back.
The League of Ireland and Pro14 would also be frozen, unless an exemption is brought in for elite level sport. The Republic of Ireland are due to face Wales at the Aviva Stadium next Sunday in the Nations League.
The leaders of the three government parties, Michael Martin, Leo Varadkar, and Eamon Ryan are expected to seek a meeting with the Chief Medical Officer tomorrow.
Dr Tony Holohan chaired this evening's meeting of the advisory group.