Ronan O'Gara will reunite with Scott Robertson to form a "dynamite" coaching team for the Barbarians against an All Blacks XV in London in November.
O'Gara, who guided La Rochelle to their first Champions Cup crown in June when they beat Leinster in Marseille, credits Crusaders boss Robertson as a major coaching influence.
The Corkman spent two years with Crusaders between time with Racing and La Rochelle, helping the Kiwi outfit to win two Super Rugby titles.