Vaccine safety experts from the World Health Organization (WHO) are meeting on Tuesday to review the Oxford-AstraZeneca jab after several European countries halted their rollouts.
A number of cases of blood clots were reported in Europe after the vaccine was administered.
But the numbers are below the level you would expect in the general population.
The UK medicines regulator and the WHO say there is no evidence of a link between the vaccine and clots.
The European Medicines Agency (EMA) - the European Union's medicines regulator - is also meeting on Tuesday.
It is expected to issue its decision on the continued use of the Oxford-AstraZeneca vaccination on Thursday.
About 17 million people in the EU and the UK have received a dose of the vaccine, with fewer than 40 cases of blood clots reported as of last week, AstraZeneca said.
Concerns that there could be a link prompted leading EU states to suspend the use of the vaccine, including Germany, France, Italy and Spain.
Other countries, including Austria, have halted the use of certain batches of the drug as a precautionary measure. However, Belgium, Poland, the Czech Republic and Ukraine said they would continue to administer the AstraZeneca vaccine.
And in Thailand, Prime Minister Prayuth Chan-ocha became the first person in the country to receive the AstraZeneca inoculation.
It is understandable anyone going to get vaccinated would be concerned given these reports.
But the regulators in the UK and Europe are clear that vaccination should continue even though some individual nations have taken a different approach.
Why? It's all to do with risk.
From what has been published so far the chance of a blood clot after vaccination is very low and at this stage looks like it could be in line with what you would expect to happen anyway - coincidence rather than cause.
In comparison, the risk from Covid to those currently being offered the vaccine is significant.
Most of continental Europe is still working its way through the over-70s.
If they are infected and have symptoms they have around a one in four chance of becoming seriously ill and needing hospital care.
In the UK those in their 50s are being invited. They have a one in 10 chance.
What is more, one of the most common consequences of serious Covid illness is blood clots.
When it comes to risk, the odds are clearly in favour of vaccination.
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