Michael Gove is self-isolating after one of his family members displayed coronavirus symptoms.
He said the family member's symptoms were mild and that he intends to continue working from home.
"In accordance with the guidance, I am isolating at home after a member of my family started to display mild symptoms of coronavirus on Sunday," he wrote on Twitter.
"I have not displayed any symptoms and am continuing to work as normal."
It comes as the Prime Minister battles the virus in an intensive care unit, where he was moved last night.
Boris Johnson has been given oxygen though is not on a ventilator, Mr Gove earlier said.
This morning, Mr Gove said "the work of Government goes on".
“We’re all working together to implement the plan the Prime Minister set out in order to try to ensure that we can marshal all the resources of government, indeed all the resources of our country, in the fight against this invisible enemy,” he told BBC Breakfast.
“The work of government goes on.
“We have a superb Civil Service and they have ensured that the machinery is there for decisions to be made by ministers, by medical and scientific experts, and for those decisions to be followed through in a way which enables us to help those at the front line.”
Dominic Raab, the Foreign Secretary, will step into the Prime Minister's place "where necessary" and has the responsibility of running the daily Covid-19 meetings.
