Doctor Hilary Jones has insisted there is no "casual link" link between the Oxford Covid vaccine and an increased risk of blood clots.
Good Morning Britain's resident medic appeared on the show on Monday after the Netherlands suspended the AstraZeneca jab for its citizens following concerns about its possible side effects.
Ireland have also suspended the roll-out of the vaccine over reports of blood clots in adults in Norway.
In spite of this, the World Health Organisation World Health Organisation have thrown their backing behind the vaccine and said the jab should continue to be administered.
Siding, with the WHO, Dr Hilary told Susanna Reid and Ben Shephard, who replaced Piers Morgan: "What we know is that whenever we have a medicine or a vaccine or a homeopathic remedy or a herbal remedy, there is a system in place whereby any possible side effects can be reported and investigated.
"And it's absolutely right and reassuring that we've got an investigation in place to look at the level of blood clots both in Norway and Ireland and all the EU countries, the UK and around the world."
He added: "But, now blood clots are very common now anyway, they happen all the time as a result of taking the oral contraceptive pill, they take place after trauma to the body where blood vessels are damaged. We see thousands of heart attacks and strokes every year because of blood clots.
"So there are going to be blood clots anyway, before the vaccine is even rolled out anyway. So we're looking at the level of blood clots that are being reported as a precautionary measure and actually, out of all of the data we have so far is that the level of blood clots is lower than it would be before vaccinations, so that in itself is reassuring."
Some viewers weren't convinced by Dr Hilary's claims, with one tweeting: "Well Dr Hilary has just said it's just a coincidence, and that the vaccine actually lowers blood clots. Do we believe him?? Naaaaaah"
