LISBON, Portugal — Portugal will start administering the Johnson & Johnson vaccine a day after European regulators gave it the go-ahead following a blood clot concern

Portuguese Health Minister Marta Temido says the shot will speed up the goal of vaccinating those over 60 years old. But she added national authorities will study findings by European regulators to determine if any restrictions should be placed on its use for younger people.

The European Union’s drug regulatory agency said Tuesday that it found a “possible link” between Johnson & Johnson’s COVID-19 vaccine and extremely rare blood clots and that a warning should be added to the label.

Last month Portugal restricted the use of the AstraZeneca vaccine to only people over 60 after it was linked to similar cases of rare blood clots.

Portugal has received 31,200 doses from the Johnson & Johnson vaccine and more deliveries are expected.