Who runs the Vatican when the Pope is sick?

Pope Leo has returned to the Vatican after undergoing surgery for lung cancer.

The pontiff was discharged from Gemelli Hospital in Rome, after four nights recovering from the surgery.

Pope Leo addressed the faithful in St Peter’s Square the day after his return, leading them in prayer.

But whilst the Pope recovers from his illness, how does the Vatican continue operating?

For the full interview, head to 7NEWS Australia’s YouTube channel. #popeleo #pope #vatican #vaticancity #rome