Holidaymakers are braced for fresh changes to travel rules this week as the Transport Secretary warned that some popular hotspots could be moved to the amber list.
Grant Shapps said Brits must be prepared for changes to the traffic light system at the next review, which is expected to be announced later today.
Ibiza, Mallorca and Menorca could be at risk of going back on the amber list - only two weeks after the popular Spanish islands were put onto the green watchlist.
The islands are reporting 258 cases per 100,000 people, according to Cercle d'Economia de Mallorca.
The move would mean younger Brits who haven't been vaccinated will have to quarantine at home for up to 10 days on return to the UK.
Fully vaccinated travellers will not have to quarantine after Monday under new rules coming tied into the end of the roadmap.
But many younger people have not yet had both jabs, meaning they will be forced to self isolate.
All travellers will still have to pay for Covid tests before and after the return.
A source told the Sun: “It’s all still up for discussion, but the figures aren’t great which is why it was on the watch list in the first place.”
Mr Shapps told BBC Breakfast: "We review these every three weeks.
"I hope we have made very clear to everybody when booking trips at the moment there is always the chance that countries will move around.
"Some countries may go to the red list, some countries may go to the green, but some may move the other way to the amber list.
"It is a fact of life that they will continue to move around as the virus continues to develop and change globally."
The Department for Transport said there was "nothing to say at the moment" on changes to the Balearic islands' travel status.
Italy, Germany and Poland are among the destinations most likely to be added to the Government's green travel list, Robert Boyle, former director of strategy at British Airways' parent company IAG, has predicted.
He said that "strong candidates" from Europe to be added to the quarantine-free list also included Austria, Bulgaria, Latvia, Lithuania, Slovakia and Switzerland.
People arriving in the UK from green list destinations are not required to self-isolate.
