Capaldi, 28, will perform in the 'secret slot' at the festival's Pyramid Stage after Alanis Morrisette on the Friday of the five-day festival at Worthy Farm in Somerset later this month.
The Scottish singer, 28, announced he would be taking a break away from the spotlight for his mental health after performing at Glastonbury in June 2023.
Lewis Capaldi looked in good health as he gave a thumbs up while attending a wrestling match in London on Friday night during a break from his music career.