Dublin is at a high risk of moving to Level Four as NPHET are set to meet this week.
The capital could face further Covid-19 restrictions following a steady rise in cases over the weekend and on Monday.
The National Public Health Emergency Team is due to get together on Thursday to decide any new measures.
And the Irish Times reports this morning that the border counties look set to be moved up Level Four when health experts meet, with concerns over Dublin also growing after a further increase in cases over recent days.
The Chief Medical Officer said last night he has not seen anywhere near enough evidence to suggest Covid-19 cases have stabilised sufficiently in the capital, a bellwether in deciding if nationwide restrictions are strong enough.
Data on Monday showed that coronavirus cases in Dublin have been broadly stable for the past week at 178.4 per 100,000 people, just above the national rate of 167.8 and lower than eight of Ireland's 25 other counties.
"We have seen some impact of the measures, the growth rate in Dublin has dropped, it's now at least lower than other parts of the country.
"We saw some stabilisation in the numbers last week but in each of the last three days, we've seen case numbers up again," health chief Dr Tony Holohan told a news conference.
"I don't think we have anything like the kind of evidence that I would like to have to conclude that the situation in Dublin is sufficiently stable... I don't think we can conclude that we have turned a corner."
Ireland's health chiefs will meet on Thursday to provide updated advice to government and Dr Holohan said that if the Level Three measures are to make a difference, his team would like to start seeing some encouraging signs by then.
The latest 14-day incidence rates in Dublin is 178.4, the ninth highest in Ireland.
