The Vatican has provided another update on the condition of Pope Francis as he . In its latest statement, the Vatican said Pope Francis has shown "gradual, slight improvement" in recent days.

The 88-year-old suffers from chronic lung disease and had part of one lung removed when he was young. His condition is now stable after he had been in critical condition at one stage. In recent days, Pope Francis has had no fever and good oxygen levels in his blood, according to doctors.

This is the first time Pope Francis has responded positively to the treatment since he was hospitalised on February 14.

The Vatican added: "The clinical condition of the Holy Father in recent days has remained stable and, consequently, indicates a good response to the treatment."

However, doctors not involved in his treatment have warned that Pope Francis faces a long and difficult recovery due to his age and condition.

Professor Christoph Lange, Secretary General of the International Union Against Tuberculosis and Lung Disease, told Reuters: "I've seen patients who have spent months in hospital in this sort of situation. Of course, he can recover, but the chances for a negative outcome are high.

"The best advice would be to let him rest, let him take whatever time he needs to get well again."

On Friday, Pope Francis shared a message thanking those who have supported him while in hospital.

He said: "I thank you from the bottom of my heart for your prayers for my health from the square, I accompany you from here.

"May God bless you and the Virgin protect you. Thank you."