This comes after the Netherlands became the latest country to suspend use of the Oxford-AstraZeneca coronavirus vaccine over concerns about possible side effects.

The Republic of Ireland earlier made a similar decision over reports of blood clotting. Denmark, Norway, Bulgaria, Iceland and Thailand have already halted their use of the AstraZeneca vaccine.

Portugal’s Directorate-General for Health and drugs watchdog Infarmed have said that the AstraZeneca vaccine can continue to be administered in Portugal and stressed that there is no evidence of a link between the vaccination and serious blood clotting events registered in other countries.

The two Portuguese entities point out that "so far there is no evidence that vaccination could be at the origin of these events".