Boris Johnson will carry on self-isolating after continuing to display mild symptoms of the coronavirus including having a temperature.
The prime minister tested positive for the virus last Friday and had been due to come out of self-isolation today.
Mr Johnson continues to work from home and chaired a coronavirus meeting on Friday morning.
He was seen on Thursday evening applauding the NHS and other key workers from his flat in Downing Street.
He has posted a video message on Twitter, explaining why he is staying isolated.