Queen Camilla is set to miss the ceremonial welcome during the Qatari state visit due to the lingering side effects of a chest infection.
Her Majesty is still expected to attend other elements of the day, according to Buckingham Palace.
The Queen has been fighting a chest infection for several weeks forcing her to withdraw from the Remembrance Sunday ceremony and the Royal Variety Performance in November.
Royal doctors are keen to prevent any further setback from the nasty chest infection.
Queen Camilla is to miss the ceremonial welcome during the Qatari state visit due to the lingering side effects of a chest infection
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It is understood the programme for the state visit has been tweaked.
Camilla, who contracted a chest infection after her long haul trip to Australia and Samoa, has been left with “significantly diminished reserves of energy”.
Royal doctors have advised Camilla to take time to rest and recover fully.
The Queen will miss the outdoor event on Horse Guards Parade where Charles and William will join the Emir of Qatar and his wife on Tuesday.
In addition, Camilla will not be present for the carriage ride back to Buckingham Palace.
The 77-year-old will be present at the lunch at the Palace on the royal party’s return and is hoping to view an exhibition in the Picture Gallery.
Camilla will join the King and their guests for photographs at the start of the banquet in the evening, and attend the banquet itself.
But she will take a short break before dinner while guests are being met in a receiving line.
After Camilla withdrew from the Royal Variety Performance, A Palace spokesman said: “Following a recent chest infection, The Queen continues to experience some lingering post-viral symptoms, as a result of which doctors have advised that, after a busy week of engagements, Her Majesty should prioritise sufficient rest.
“With great regret, she has therefore withdrawn from attendance at tonight’s Royal Variety Performance. His Majesty will attend as planned.”
She also pulled out of the Remembrance Sunday Weekend events as a result of the “lingering” symptoms.
Camilla will hope to attend the Princess of Wales Together At Christmas service on December 6.