Croatia and Turkey could be removed from the government's travel safe list, amid similar fears about Greece - throwing more holidays into disarray.
Thousands of Brits have already flown out to the holiday hotspots but could now be faced with two weeks quarantining when they return.
On Sunday, Turkey recorded its highest number of coronavirus cases since June as 1,256 people were confirmed positive and the death toll climbed by 21.
While there are 18.5 infections per 100,000 people, it's a significant surge on the 15.8 recorded last month. Similarly, Croatia has recorded 162 new infections in the last 24 hours, meaning it has passed the Downing Street's quarantine threshold of 20 cases per 100,000 people in a week.
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