Up to five million people in the UK reportedly face being knocked back from holidays to the European Union after a receiving certain doses of the AstraZeneca vaccine.
The Telegraph reports that a number of people have been given a version of the jab called Covishield, which is produced by the Serum Institute of India.
It is claimed that the EU’s so-called vaccine passport scheme, which was introduced from yesterday, does not recognise the version.
Covishield is yet to be approved by the European Medicines Agency (EMA).
This could potentially lead to some Scots being refused entry into a number of European countries when the batch numbers on their vaccines are checked.
Those with the vaccine batch numbers 4120Z001, 4120Z002 and 4120Z003 could be impacted, according to the newspaper.
Oxford/AstraZeneca jabs that are produced in the UK and Europe, which is sold under the Vaxzevria name, will be unaffected as part of the EU’s Digital Covid Certificate scheme.
Pfizer/BioNTech, Moderna and Johnson & Johnson jabs are also included on the list of approved EMA vaccines.
A spokesperson for the European Commission said: “Entry into the EU should be allowed to people fully vaccinated with one of the vaccines authorised in the EU.
“Member States are…not required to issue certificated for a vaccine that is not authorised on their territory.”
It is unclear as to how many Covishield vaccines have been administered in Scotland.
The Scottish Government has been approached for comment.
Plans to scrap isolation rules for fully vaccinated holidaymakers arriving back in the UK from amber list countries could be approved later this month, according to reports.
The UK Government is aiming to exempt amber list travellers from having to quarantine by July 26.
Scottish Government officials say they are “working closely” with all devolved nations over the future of international travel.
A spokesperson said yesterday: "From the outset we have said caution is required regarding international travel and people should think very carefully about travelling abroad as situations can suddenly change.
“We continue to work closely with the other home nations and are cautiously supportive of exploring options for the easing of restrictions for fully vaccinated travellers arriving from countries on the amber list - but only if the clinical advice supports it and if systems are in place to ensure the wider safety of the Scottish population.”
A spokesperson later added: “People should check the entry requirement for the country they are visiting before travelling.
“All AstraZeneca vaccines given in Scotland appear on the record of vaccination as Vaxzevria - EU/1/21/1529.
“A number of EU countries have already indicated they are happy to accept Scotland’s record of vaccination where they want evidence that people have been fully vaccinated as a condition of entry. We are not aware of any EU countries refusing to accept this statement.”
