The Princess of Wales will not be returning to public duties for the Colonel’s Review after speculation she would be well enough to take part.
The ceremonial military event takes place on 8 June in London, the weekend before Trooping the Colour, and as colonel in chief of the Irish Guards, Kate would usually take the salute.
The news she will not be taking part this year comes as Buckingham Palace confirmed the King will participate in Trooping the Colour on 15 June.
The monarch returned to public duties last month after it was confirmed in February that he had been diagnosed with an undisclosed form of cancer.
Kate revealed in March that she also had cancer and was undergoing preventative chemotherapy.
The princess has not been taking part in public engagements since, and it is unclear if she will attend the Trooping the Colour ceremony alongside other members of the Royal Family.
In February, the Ministry of Defence appeared to confirm she would attend the Colonel’s Review but subsequently had to remove the announcement on its website.
Instead the salute will be taken by Lieutenant General James Bucknall.
The former commander of the Allied Rapid Reaction Corps has attended every King’s Birthday Parade since 2009 when he was appointed colonel of the Coldstream Guards, having served as a Coldstream Guards officer for more than 45 years.
King to attend Trooping the Colour
Due to his cancer diagnosis there were questions about whether the monarch would be able to take part in Trooping the Colour on horseback as he did for his first birthday parade as monarch last year.
But the palace has now announced that the King will inspect the soldiers seated in an Ascot landau carriage with the Queen.
Attendance and participation of other members of the family will be confirmed nearer the time.
The King is likely to travel by carriage with the Queen during the traditional procession to and from Horse Guards Parade in Whitehall where the Trooping the Colour ceremony takes place.
Members of the Royal Family traditionally gather on the balcony of Buckingham Palace afterwards.
The King had been carrying out a busy programme of engagements since it was announced just over four weeks ago would be returning to public facing duties.
Rishi Sunak’s decision last week to call a surprise summer General Election has meant the monarchy has postponed any engagements “which may appear to divert attention or distract from the election campaign”.