Travellers arriving in England from Slovenia and Guadeloupe after 4am on Saturday will have to isolate for two weeks.
The two countries are being added to the quarantine list, Transport Secretary Grant Shapps announced.
But Thailand and Singapore are being removed from the list.
Ministers say countries where the coronavirus infection rate is higher than 20 per 100,000 people are at risk of being added to the list – but last week the UK tipped over that threshold itself.
Since then, tough restrictions have been imposed on millions of people.
The latest will come into force on Friday in Northumberland, North Tyneside, South Tyneside, Newcastle-upon-Tyne, Gateshead, Sunderland and County Durham.
Source : Sky News