Archbishop Diarmuid Martin has backed Pope Francis as the right man to reform the hierarchy of the Catholic Church.
Speaking after a Mass in Dublin in honour of the new pontiff, he said Francis will "very clearly" address the child sex abuse issue, and address past and future issues of the Church.
Archbishop Martin says Pope Francis has already begun to change the Vatican.
"I think his eyes will be focused on the future," he said.
"Obviously, there are a number of questions about the past that he'll have to take up and today he has just announced that he has appointed the people who are working in the curia temporarily until he has time to examine where their future is.
"So he's obviously going to change things."