The Boxing Day interpreter match between Munster and Leinster has been postponed due to a number of Covid-19 cases in the Leinster camp.
Leinster were forced to give up their Champions Cup match in Montpellier last week for the same reason.
The United Rugby Championship is considering dates to reschedule the traditional festive match.
Leinster are still due to face Ulster on January 1.
Ahead of their Champions Cup home opener against Bath on December 11, the Eastern Province club reported four positive cases of coronavirus in their camp – three players and one non-playing staff member.
In preparation for the Montpellier game, they reported another unspecified number of additional Covid cases among players.
The match wasn’t officially called off until the day before the match, when Leinster named a squad that included eight changes since the victory over Bath.
Interpro was due to be played at Thomond Park in front of a small crowd after new measures took effect in the Republic of Ireland on Monday limiting spectators to 50% of the stadium’s capacity and a maximum of 5,000.