Former Ireland coach Eddie O'Sullivan said the potential cancellation of the Japan-Scotland Pool A game on Sunday would be a "catastrophe" for the Rugby World Cup.
With Super Typhoon Hagibis expected to hit Japan this weekend, World Rugby took the unprecedented decision to cancel two Rugby World Cup games, the England-France game in Yokohama and the New Zealand-Italy game in Toyota.
The pivotal Japan-Scotland game is fixed for Yokohama on Sunday and remains under review. There is no contingency to move the game and re-fix it for another date.
The game will thus be declared a 0-0 draw and Scotland will, incredibly, be eliminated without having had the chance to compete for a quarter-final spot in their final pool game.
Speaking on the Six One News on RTÉ1, O'Sullivan said it was hard to believe that World Rugby hadn't put in place any contingency plans.
"2009 was when the World Cup was awarded to Japan. It was flagged at the time that at this time of the year, Japan is liable to have typhoons.
"Everybody has assumed there would be contingency plans. That's the big takeaway here. That there isn't a contingency plan. If there was a contingency plan, the two games wouldn't be cancelled.
"Now, the games cancelled don't really derail the tournament because I don't they would really have changed the outcome of those pools.
"So World Rugby might get away with it even though there is a lot of egg on their face and it does take away from the tournament.
"But the worst case scenario is if the Japan-Scotland game is cancelled at the weekend. That would be a catastrophe.
"Because Scotland would effectively head home without being given a chance to qualify for the quarter-finals.
"That would put a huge shadow over the tournament and there's no way out from under that. To find themselves in that position in terms of a global tournament is unconscionable.
"It affects everybody, not just the players on the field, not just the supporters. But the whole public are tuned into this at the moment. It's the worst time ever. Plus there's the costs involved. You have television and media who are depending on these games and they're going to lose revenue streams if they're not played. So, it really is a mess.
"Given this was flagged ten years ago, it's hard to believe they hadn't figured out a contingency plan that didn't fall away at the first hurdle."