The former Munster man competed in three during his career.
La Rochelle head coach Ronan O'Gara says Ireland's failure to capitalize at a World Cup during his time in the green jersey eats at him.
O'Gara went to three World Cups in 03, 07, and 2011, failing to get beyond the quarter-finals.
He says the preparation for Ireland's sluggish performance in France thirteen years ago is still a sour point for him: