"His arrival on the international scene will be forever remembered for that wonderful image of Ronan and his long-time scrum half partner, Peter Stringer, on their international debut, being sheperded by Mick Galwey as they emotionally lined up for the national anthem.
"Ronan's career since then has been stellar and marked by his extraordinary ability to deliver, time and again, for Ireland and Munster. His drop goal to seal Ireland's Grand Slam victory at the Millenium Stadium in Cardiff being arguably his finest hour."
He added: "Irish rugby will undoubtedly miss his extraordinary talents but it is pleasing to see him continue his career within the game.
"We thank him for his total commitment and proferssionalism and wish him, his wife Jessica and family every good fortune into the future."