Scottish Secretary Alister Jack is self-isolating after developing mild symptoms of coronavirus.
The Conservative MP for Dumfries and Galloway said he has a mild temperature and a cough.
He has not been tested for Covid-19 but is self-isolating and working from home.
It comes after Prime Minister Boris Johnson and Health Secretary Matt Hancock confirmed on Friday that they have tested positive for Covid-19 while England's chief medical officer, Professor Chris Whitty, said that he has symptoms.
Mr Jack said: "In the past 24 hours, I have developed mild symptoms associated with coronavirus.
"In line with medical guidance, I am self-isolating and working from home."
The MP has been at home in his constituency since Wednesday.
Mr Johnson, Mr Hancock and Mr Whitty are all self-isolating and continuing to work.
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