Portugal could be put back on the UK travel quarantine list in days as its coronavirus rates rise again.
The country is now in the 'amber zone' with 16.4 cases per 100,000, according to travel expert Paul Charles from The PC Agency.
Mr Charles says that while Italy still remains in the 'green zone' cases have gone from 7 to 13 in a week sparking fears it could also join Spain and France on the quarantine list.
A seven-day rate of 20 Covid-19 cases per 100,000 people is the threshold above which the UK Government considers triggering quarantine conditions.
Travel restrictions for holidaymakers in England were initially loosened on July 10, but Portugal and the US were excluded from the 'safe' list of 73 countries.
The popular holiday destination was finally removed from the quarantine list on August 20, meaning travellers no no longer have to self-isolate.
Are you on holiday in Portugal or Italy at the moment or due to fly out? Email us at webtravel@trinitymirror.com
Transport Secretary Grant Shapps has warned holidaymakers that quarantine rules can change rapidly.
Yesterday, Switzerland, Jamaica and the Czech Republic were stripped from the 'safe' list, meaning people arriving in the UK after 4am on Saturday must self-isolate for two weeks.
France, Spain, Croatia, Trinidad and Tobago, Austria, Monaco, Malta, Turks & Caicos and Aruba, Andorra, Belgium and the Bahamas, Serbia and Luxembourg have also previously been removed.
Mr Shapps told Sky News: “Look there is a travel corridor list and I think it contains probably still about 55, 60 countries. It changes every week – a country went on – Cuba went on – the list yesterday, or goes on at the weekend.
“So, they are there for a reason. However, when people travel at the moment when coronavirus is still a thing… just need to be aware that unfortunately things can change very quickly and, you know, if you go with your eyes open and you know that things can change, it won’t then come as so much as of a surprise.
“Though as I say, sometimes countries just move very quickly.”
Mr Shapps has previously said a range of factors are taken into account when the Joint Biosecurity Centre decided whether to add a country to the quarantine list.
They include: estimated prevalence of Covid-19 in a country; the level and rate of change in the incidence of confirmed positive cases; the extent of testing in a country, the testing regime and test positivity; the extent to which cases can be accounted for by a contained outbreak as opposed to more general transmission in the community; government actions and "other relevant epidemiological information".
