The Queen has been advised by doctors to rest for two further weeks and will not undertake official visits during this time, Buckingham Palace has said, the BBC reports.
The palace said the monarch, 95, could undertake some light duties during that time, including virtual audiences.
Officials said it is her “firm intention” to attend Remembrance Sunday events on 14 November.
The Queen underwent preliminary medical checks in hospital on 20 October after cancelling a visit to Northern Ireland.
She resumed public engagements on Tuesday this week by meeting ambassadors via video link from Windsor Castle.
But it was announced that she will not attend the COP26 climate change summit in Glasgow. The palace said she would deliver her address to delegates using a recorded video message instead.
She recorded the speech on Friday afternoon.
In a statement, Buckingham Palace said: “The doctors have advised that Her Majesty can continue to undertake light, desk-based duties during this time, including some virtual audiences, but not to undertake any official visits.
“Her Majesty regrets that this means she will be unable to attend the Festival of Remembrance on Saturday, November 13.”
