Prince Harry, as one of the counsellor of the state can step in for Monarchy in Prince William's absence amid King Charles III and Princess Kate Middleton’s recent medical procedures.

The royal expert Richard Fitzwilliams in an exclusive conversation with US Weekly has weighed in on the concerns raised regarding the future of monarchy, where the Prince of Wales has also postponed all his royal engagements to support his family.

In the wake of all three royals Kate, Charles and William cancelling all their royal engagements, Fitzwilliams suggested, the Duke of Sussex can step in for Monarchy in his brother's absence.

 “[William] is a Counsellor of State, who, in theory, could stand in for the monarch in the event of him being abroad or of incapacity,” Fitzwilliams said.

He continued, “If necessary, Counsellors of State could step in for the monarch. There are several, including [Prince] Harry and [Prince] Andrew, who obviously would not be asked to.”

Kate Middleton 'abdominal surgery':

On Wednesday, the Kensington Palace announced on Wednesday regarding Kate Middleton's abdominal surgery.

"Her Royal Highness The Princess of Wales was admitted to hospital yesterday for planned abdominal surgery," the statement began.

It continued, "The surgery was successful and it is expected that she will remain in hospital for ten to fourteen days, before returning home to continue her recovery. Based on the current medical advice, she is unlikely to return to public duties until after Easter."

Read More: King Charles to undergo prostate treatment amid Kate Middleton's successful abdominal surgery

"The Princess of Wales appreciates the interest this statement will generate. She hopes that the public will understand her desire to maintain as much normality for her children as possible; and her wish that her personal medical information remains private," the statement added.

The official statement concluded, "Kensington Palace will, therefore, only provide updates on Her Royal Highness' progress when there is significant new information to share. The Princess of Wales wishes to apologise to all those concerned for the fact that she has to postpone her upcoming engagements. She looks forward to reinstating as many as possible, as soon as possible."

King Charles will go through  'corrective procedure' amid enlarged prostate diagnosis:

Shortly after Middleton, 42, Buckingham Palace revealed that Charles, 75, will go through a “corrective procedure” amid an enlarged prostate diagnosis. 

The palace further confirmed that Charles, whose condition is benign, will subsequently postpone any public engagements during his recovery.