Former New Zealand coach Steve Hansen warned in-form Ireland they still have a huge point to prove at the Rugby World Cup this year.
Andy Farrell's side completed a Grand Slam against England on Saturday, sealing a Six Nations crown and reaffirming their place as the world's number one team.
But with France 2023 looming in just under half-a-year, they will have to overcome their own history, having never progressed beyond the quarter-final stage.
Hansen, who knocked Ireland out in the last eight with the All Blacks four years ago in Japan, feels they must defy their own tournament reputation to triumph.
"They are going well, [are] ranked number one in the world, and they have had a great year so far," he said.
"Every time a team is number one in the world, you have got to consider them to be a World Cup contender. But it is a tough tournament to win.
"They have seemed to struggle a little bit at World Cups. If it was the All Blacks, they would probably be called chokers. They have come a long way, they believe in themselves. They are a very good side.
"So they are definitely a contender. But they will have to overcome the pressure of not having gone past the quarter-finals before, and there will be a lot of pressure involved in that.
"If they get through to the semi-finals, then they are in new territory. That is something they will have to deal with that they've never dealt with before, and it is always hard to deal with something you haven't dealt with before."
Ireland open their campaign against Romania on September 9, before they face Tonga, Scotland and reigning champions South Africa.