Irish holidaymakers have been jetting off in their thousands since international travel resumed last month.
The latest of these warnings comes as the European Centre for Disease Prevention and Control has issued guidance on the areas that have been worst hit in recent days by the virus. Areas in the south of France are also considered to be a "dark red" zone, while most of Italy has been classified as "orange".
"In the case of recovery from COVID, passengers must present evidence that at least 11 days have passed since they received a positive result on a NAAT.The Covid Certificate shows whether someone has been vaccinated against the virus, has recently recovered or had a negative test.
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