Pope Francis, who is receiving treatment in hospital for bronchitis, will not appear in public on Sunday to lead his usual weekly prayer with pilgrims, the Vatican said.
Gemelli hospital, Rome’s largest, has a special suite for treating popes, and is known especially for often treating the late Pope John Paul II during his long papacy.
Earlier, the Vatican said the Pope would remain in hospital as long as necessary for his treatment.
Outside the hospital on Saturday, groups of people were gathering under a famous statue of John Paul II to pray for Pope Francis.
The Pope’s treatment on Saturday was “slightly modified based on further microbiological findings”, the statement said.