The European Medicines Agency says unusual blood clots should be listed as very rare side effects of the Johnson and Johnson Covid vaccine.
The EMA says the overall benefits of the vaccine outweigh the risks.
In a statement, the regulator says it took into consideration all the data currently available, with eight reports of serious cases of unusual blood clots in the US, one of whom died.
The cases reviewed were very similar to the cases that occurred with the COVID-19 vaccine developed by AstraZeneca.
As of April 13th, over 7 million people had received the one shot Johnson & Johnson vaccine in the States.