The IRFU have called on a journalist to withdraw allegations he made about them in an article on Sunday.
Stephen Jones, writing in the Sunday Times, claimed that the Irish union, along with their New Zealand counterparts, had intervened to attempt to make sure today's Japan versus Scotland game could not be re-arranged.
The fixture was under threat until shortly before kick-off owing to adverse weather conditions, namely Typhoon Hagibis, with World Rugby confirming the fixture was to take place in the early hours of Sunday morning.
The cancellation of the fixture would have seen the Scots eliminated from the competition.
A statement released by the IRFU calls Jones's claim that they tried to intervene "completely false."
The statement continues: "The inference within the article that the IRFU made representations to World Rugby on the matter is totally without foundation.
"The Irish Rugby Football Union calls on Stephen Jones to immediately withdraw this scurrilous and untrue allegation."
Scotland can set-up a quarter-final date with New Zealand on Saturday if they beat Japan, while preventing them securing a bonus point.
Should the Scots advance, then Ireland will be playing South Africa on Sunday. Otherwise, it's a date with the All Blacks in Chōfu for Joe Schmidt's side.