Prime Minister Boris Johnson speaks during a news conference on the ongoing situation with the coronavirus disease (COVID-19) in London, March 22, 2020. (Photo: Agencies)

British Prime Minister Boris Johnson is not on a ventilator but has had some oxygen support and if his condition changes the government will make an official statement, Cabinet Office Minister Michael Gove said on Tuesday.

"He's not on a ventilator no," Gove told LBC radio. "The prime minister has received some oxygen support and he is kept under, of course, close supervision."

Gove also said Foreign Minister Raab can effectively deputise for PM in chairing meetings and taking decisions at meetings.