Downing Street says Matt Hancock will address the nation today while the Prime Minister self-isolates.
Boris Johnson was due to address the nation later this afternoon to provide an update on the latest coronavirus infection rates.
But the Prime Minister is now self-isolating after conducting a meeting in which a fellow Conservative MP tested positive for coronavirus.
Downing Street has now confirmed Mr Hancock, the health secretary, will stand in for the Prime Minister.
Earlier this year, when Mr Johnson contracted the virus, ministerial duties fell to Dominic Raab who led committees and provided the daily updates.
But the PM is said to be conducting most of his work currently using Zoom as he told the nation he was ‘in good health’ on a social media update.
In a video posted to Twitter he said: “Hi folks, the good news is that NHS Test and Trace is working ever-more efficiently, but the bad news is that they’ve pinged me and I’ve got to self isolate because someone I was in contact with a few days ago has developed Covid.
“It doesn’t matter that we were all doing social distancing, it doesn’t matter that I’m fit as a butcher’s dog, feel great – so many people do in my circumstances.
“And actually it doesn’t matter that I’ve had the disease and I’m bursting with antibodies. We’ve got to interrupt the spread of the disease and one of the ways we can do that now is by self isolating for 14 days when contacted by Test and Trace.”