Overview
- Replacement fly-half Harry Byrne landed an 83rd‑minute penalty to clinch a 25-24 win at the Aviva Stadium after La Rochelle had edged ahead late through Ihaia West and Nolann Le Garrec's touchline conversion.
- Champions Cup debutant JJ Kenny scored a rapid brace as Leinster raced 12-0 up before the visitors fought back to lead 17-12 entering the final quarter.
- Leinster earned a try bonus point and are guaranteed a last‑16 berth at the top of Pool 3, with a closing pool match away to Bayonne next weekend.
- La Rochelle remain in contention for qualification and will host Harlequins in the final round needing a favorable result.
- Elsewhere in Round 3, Bristol beat the Bulls 61-49 to qualify, Sale defeated the Sharks 26-10 to advance, and Glasgow overcame Clermont 33-21 to book a spot and eliminate Clermont.