The EU still does not recognise a version of the AstraZeneca vaccine called Covishield, which is produced by the Serum Institute of India.
The doses were administered to up to five million people in the UK, but have not yet been approved by the European Medicines Agency (EMA), which regulates vaccinations in the bloc.
UK tourists who have been given the Indian-made doses would be flagged up at the EU border and could face being denied entry.
The EU Digital Covid Certificate is now in operation to allow travel without quarantine, but it would not recognise the Indian-made AstraZeneca vaccines with the batch numbers 4120Z001, 4120Z002 and 4120Z003.