Prince Harry and Meghan Markle, who are currently on tour in the UK, are expected to extend their stay as the Queen has been placed under “medical supervision”.
The Duke and Duchess of Sussex were due to speak at the WellChild Awards in London tonight before returning to California.
The couple are expected to postpone their visit amid the Queen’s major health crisis.
However, the Sussexes have yet to make an official announcement in this regard.
Meanwhile, Prince Charles and Prince William will be visiting Balmoral, Kensington Palace has been informed.
“Following a further assessment this morning, the Queen’s doctors are concerned for Her Majesty’s health and have recommended that she remains under medical supervision,” an official statement read.
“The Queen remains comfortable and at Balmoral.”