The King will hold face-to-face meetings in London next week despite his ongoing cancer treatment.
Charles, 75, will spend a day or so working in the capital in a trip likely to coincide with medical appointments.
He has been based at Sandringham since leaving hospital last week after prostate surgery.
He flew to London to undergo treatment for his undisclosed cancer on Monday, 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 the Church of St Mary Magdalene on the Sandringham estate on February 4
Camilla said King Charles, 75, who underwent his first bout of 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 bout of 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 extremely well under the circumstances. He is very touched by all of the letters and messages the public have been sending from everywhere. That’s very cheering.’
The 76-year-old made the remarks as she arrived at Salisbury Cathedral for a charity musical evening.
The Queen had long been scheduled to attend the musical evening to celebrate the work of three Wiltshire charities and travelled five hours from her husband’s side at Sandringham to be there.
She is a firm supporter of The Wiltshire Bobby Van Trust, The Wiltshire Air Ambulance and Community First, as well as the regimental charities of the Grenadier Guards and The Rifles.
But thanks to the inclement weather and the King’s recuperation for his first treatment for his undisclosed cancer, her visit almost didn’t come off.
Camilla, who hasn’t left her husband’s side since his diagnosis, has been with him in Norfolk all week as he recuperates.
Also, Kensington Palace has announced Prince William’s fourth annual Earthshot Prize awards will take place in Cape Town in November.