The president of the European Commission has been forced to into self-isolation after meeting someone who later tested positive for Covid-19.

Ursula von der Leyen announced the development on social media, saying she had tested negative on Thursday and will be tested again on Monday.

The German politician was informed she would need to go into quarantine after meeting with an unnamed individual last week who has since discovered they are infected.

She wrote on Twitter:

I’ve been informed that I participated in a meeting last Tuesday attended by a person who yesterday tested positive for COVID-19. In accordance with regulations in force, I’m therefore self-isolating until tomorrow morning. I’ve tested negative on Thursday & am tested again today

— Ursula von der Leyen (@vonderleyen) October 5, 2020
It comes at a crucial point in Brexit negotiations, with the EU chief having agreed with Boris Johnson this weekend to work together towards a trade deal.

The head of the EU executive was visiting Lisbon for talks with senior Portuguese officials, but this detail was not mentioned in her announcement.

When she is in Brussels, Ms Von der Leyen generally stays in a small flat on the 13th floor of the European Commission’s Berlaymont headquarters, near her office.

A steward walks amid empty seats inside the arena during a rain delay at Roland Garros during the 2020 French Open in Paris, France, on Sept. 27.

She is not the first senior EU official to be quarantined in recent weeks.

Last month the president of the European Council, Charles Michel, was forced to postpone a European leaders’ summit for a week after a security guard in his team tested positive.

The summit went ahead on Thursday and Friday last week, and was attended by Ms Von der Leyen.