The UK has added Denmark, Iceland and Slovakia to its coronavirus quarantine list.
It means anyone arriving back in the UK from the trio of countries will have to self-isolate for two weeks.
The change comes into effect on Saturday at 4 am.
"There has been a consistent increase in COVID-19 cases per 100,000 of the population in Iceland, with data showing a 921% increase in newly reported cases over the past week," said the UK's Department of Transport in a statement.
"In Slovakia, there has been a consistent increase in the weekly case rate of COVID-19 over the past 4 weeks, with a 115% increase in weekly cases per 100,000 between 2nd and 23rd September.
"There has also been a 508% increase in newly reported cases per week in Denmark over the past four weeks."
In recent weeks Hungary, Portugal and Slovenia have also been added to the quarantine list.