Countries such as Germany and Poland are expected to be part of the updated travel green list when it's released next Monday.
It means people will be allowed to visit those areas without the need to self-isolate when they return to Ireland.
The green list will be in place until next month until Ireland aligns with the EU's 'traffic light' plan - which would see countries designated as 'green', 'orange' or 'amber' depending on the number of new cases per 100,000 people over a two-week period.
The new approach would define a 'green country' as having an incidence rate of less than 25 cases per 100,000 people.
However, the plan has yet to be finalised - with EU leaders expected to sign off on it the approach on October 13th.
In the meantime, there's set to be weekly updates to the existing travel list.
The current European situation will be reviewed tomorrow, with any changes coming into effect from Monday.
Based on the 25 cases per 100,000 criteria, countries such as Cyprus, Sweden, Poland and Germany would be added to the existing list of 10 countries.
'Two very important countries'
Speaking on Newstalk Breakfast, Eoghan Corry - editor with Travel Extra - said it's not yet entirely clear how the new travel regime will work, but there was some good news.
He said: "There's very little clarity... but one of the very clear things it that two very important countries are getting onto the green list.
"Germany is huge for inbound tourism into Ireland. Poland is very, very important... 120,000 Poles live in Ireland."
He noted that the European Union tends to be 'inclusive' with their approach rather than the 'exclusive' one taken by Ireland so far - meaning more countries are likely to be considered 'green' under the new approach.
Based on current figures, countries like Spain, France, Croatia and Hungary would be considered 'red zones' under the EU's proposed approach.
A majority of other countries in the bloc would be 'orange' or 'green'.
Latest EU figures put Ireland's 14-day rate at 48.5 - just under the threshold of being classified as a red zone.