King Charles facing major Trooping the Colour decision after Prince William's intervention

King Charles III is facing a major decision over who will appear on the balcony at this year's Trooping the Colour, it has been reported.

As one of the biggest events in the royal calendar, this year's Trooping the Colour is set to take place on Saturday, June 15, as reported by the Mirror.

Following the major event, members of the Royal Family typically appear on the balcony at Buckingham Palace for the RAF flypast.

During the reign of the late Queen Elizabeth II, various members appeared on the balcony, but at last year's event only selected royals were allowed to make an appearance.

At last year's Trooping the Colour, royals such as Zara Tindall and Princess Beatrice and Princess Eugenie didn't appear - but recently questions have arisen over whether royal fans can expect to see them on June 15.

Zara and the princesses - as well as Peter Phillips - rallied around Prince William to support him at a garden party he hosted at Buckingham Palace - in the absence of his father - earlier this month.

According to the Telegraph, royal editor Hannah Furness said: "The Prince of Wales would be keen to extend similar invitations again, in the spirit of including the wider family, as his grandmother once did.

"The King, too, has seemed visibly buoyed by the company of his nieces and nephews, rarely looking happier than he did clasping Zara Tindall in a hug at the Royal Windsor Horse Show this month on his way back from cancer treatment."

She further explained: "He must now decide what to do for this year's Trooping the Colour, in which the state of the Royal Family will be captured in that all-important 'balcony moment' displaying who is in and who is out."

Due to the continuation of her cancer treatment, Kate, Princess of Wales is not set to make an appearance at the event.