Ministers are due to meet on Thursday to decide the travel rules that will be in place for most of August.
Reports have suggested there is a fallout among Cabinet ministers over proposals to introduce an amber watchlist, designed to warn travellers of the possibility that countries with concerning coronavirus data - which could potentially include Italy and Spain - could be put onto the red list at short notice.
There is already a green watchlist to alert holidaymakers that certain destinations could be relegated to the amber list, where anyone not fully vaccinated has to self-isolate for 10 days on their return.
READ MORE: Latest Covid rates in your area as infections drop sharply around the North East
All travellers entering the UK from green list locations do not have to self-isolate, while there is also an amber-plus list, containing only France at present, which scraps the quarantine exemption for the double-jabbed.
Analysts have predicted that Spain could be the next country to go on the amber-plus list, in what would be a blow to British tourists given the country is the UK's most popular tourist destination, while France could be promoted to amber once again.
No 10 sources said it was too early to speculate on what changes might be made next week.
A spokesman for the Whitehall department said the traffic light system was "kept under regular review" and "based on the latest risk assessment from the Joint Biosecurity Centre", which assesses the public health risk of international travel.
Here are 11 countries that could move to the green list - but it's worth checking the latest Foreign Office advice as it does not mean the country in question is open to British travellers.
These countries could move to the green list:
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