The King will hold face-to-face meetings in London next week despite his ongoing cancer treatment.
Charles, 75, will spend about a day working in the capital on a trip that will likely coincide with his medical appointments.
He has been at Sandringham since leaving hospital last week following prostate surgery.
On Monday he flew to London to undergo treatment for his undisclosed cancer, before returning to Norfolk.
But sources say the King is well enough to hold a limited number of face-to-face meetings.
King Charles III and Queen Camilla attend the Sunday service at St Mary Magdalene Church on the Sandringham estate on February 4.
Camilla said King Charles, 75, who underwent his first treatment earlier this week, was “very touched” by all the messages of support he has been receiving.
The King’s helicopter is seen landing at Buckingham Palace, London, following the announcement of King Charles III’s cancer diagnosis.
Camilla said King Charles, 75, who underwent his first treatment earlier this week, was “very touched” by all the messages of support he has been receiving from around the world.
Queen Camilla said: “He is doing very well under the circumstances.” He is very touched by all the letters and messages that the public has been sending from all over. That’s very encouraging.’
The 76-year-old made the remarks as she arrived at Salisbury Cathedral for a charity musical evening.
The Queen had long planned to attend the musical evening to celebrate the work of three Wiltshire charities and traveled five hours from her husband’s side in Sandringham to be there.
She is a strong supporter of The Wiltshire Bobby Van Trust, The Wiltshire Air Ambulance and Community First, as well as the Grenadier Guards and The Rifles regimental charities.
But thanks to bad weather and the King’s recovery for his first treatment for his undisclosed cancer, his visit almost didn’t go well.
Camilla, who has not left her husband since his diagnosis, has been with him in Norfolk all week as he recovers.
Additionally, Kensington Palace has announced that the fourth annual Prince William Earthshot Award will take place in Cape Town in November.