Former Munster and Ireland fly-half O’Gara had guided La Rochelle to two Champions Cup final wins during the past three seasons.

Leinster will take on Harlequins with Ulster facing a tough task when they take on top seeded side Bordeaux Bègles

So far, the FA Cup game is goalless while Leinster lead against La Rochelle in the Investec Champions Cup.

Leinster beat Ronan O'Gara's La Rochelle side 40-13 at the Aviva