As per reports, Cavaleri told Il Messaggero "In my opinion, we can say it now, it is clear there is a link with the vaccine".
"In the next few hours, we will say that there is a connection, but we still have to understand how this happens", Cavaleri said. "But we still do not know what causes this reaction".
A number of countries have imposed restrictions on the use of the AstraZeneca vaccine, especially in younger adults.
The EMA has consistently said that "The benefits of the AstraZeneca vaccine in preventing Covid-19, with its associated risk of hospitalisation and death, outweigh the risks of side effects".
Scientists are exploring several possibilities that might explain the extremely rare brain blood clots that occurred in individuals in the days and weeks after receiving the AstraZeneca vaccine.
"We were scheduled to have received over 3 million doses of the AstraZeneca vaccine from overseas by now, which have not arrived in Australia because of the problems with shipments that we've seen happening here and in other parts of the world", Acting Chief Medical Officer Michael Kidd told Sky News.
Mr Cavaleri said they are still trying to understand where exactly this link comes from.
"Among the vaccinated, there are more cases of cerebral thrombosis. among young people than we would expect".
The EMA is expected to give an update of its investigation on Wednesday.
The majority of Australia's near 26 million population will be administered the AstraZeneca vaccine, with 50 million doses set to be produced locally from the end of March. The move will no doubt slow down the vaccine's rollout and governmental plans for widespread national inoculations, however, it will also hopefully keep people safe from blood clots.
The UK's health agency has identified 30 cases of rare blood clot events out of 18.1 million doses of the jab administered up to and including 24 March.
Experts from the European Medicines Agency are meeting today to finalise their evaluation of rare cases of blood clotting and its possible relationship with AstraZeneca's Covid-19 vaccine, whose use is suspended in some European countries for people under 60 years of age.