The Queen may miss the annual New Year's Day church service at Sandringham, with a decision expected to be taken this morning on whether she is well enough to attend.
The 90-year-old monarch has not been seen in public for 11 days since she and Prince Philip fell ill with what was officially described as "heavy colds".
The illness forced the Queen to miss the Christmas Day service at St Mary Magdalene church in Sandringham for the first time in 28 years.
Philip, 95, who is known for his robust health, was well enough to attend and walked briskly to the church as usual on Christmas morning with Prince Charles, Prince Harry and other family members.