Alain Rolland will referee the Leinster-Munster game this Saturday (7pm).
The Irish official has been drafted in to replace the injured Pascal Gauzere, who was lined up to take charge of the derby clash at the Aviva Stadium.
“The IRFU and both coaches are fully in agreement that Alain is the best referee available,” a PRO12 spokesman said today.
Both Leinster and Munster will name their teams on Friday afternoon.