Vatican officials announced on Sunday that Pope Francis is currently suffering from mild renal insufficiency, also known as kidney failure, amid his treatment for bilateral pneumonia.

“Pope Francis is touched by the numerous messages of affection and closeness that he continues to receive in these hours,” the Vatican statement said. The pope expressed particular gratitude for the well wishes he received from his fellow patients in Rome’s Gemelli Hospital and asked for continued prayers.

Pope Francis, who has been hospitalized for more than a week, remains in “critical” condition and developed an “asthmatic respiratory crisis” earlier on Saturday, the Vatican said in a statement.