They were originally slated to do battle over Christmas.
The postponed Pro 14 meeting of Munster and Leinster has been rearranged.
The provinces will meet at Thomond Park on Saturday January 23rd.
The date has been left vacant by the suspension of the Heineken Champions Cup.
Meanwhile, French authorities are meeting Six Nations organisers today to discuss their involvement in international rugby.
The European Champions Cup has been suspended for now following a request from the French Ministry for Sport.
The Six Nations start at the beginning of next month, with France's first trip abroad against Ireland on Valentine's Day.
The Champions Cup may now be run off as a knockout competition in April.
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