Leinster’s 26‑27 loss to La Rochelle in 2023 remains the fiercest Champions Cup final, echoing the 2021 showdown in Bilbao where the Irish face Bordeaux‑Begles.

The 2023 final saw Leinster surge to a 17‑0 lead, only for La Rochelle to rally from 17 points down, a comeback that still ranks as the largest in European Cup history. Georges Henri Colombe sparked the turnaround with a late try, while Michael Ala'alatoa’s red card sealed the fate.

With a 27‑26 victory, La Rochelle became back‑to‑back champions, setting a new benchmark for resilience. The result underscores the unpredictability of the Champions Cup and reminds fans that dominance can shift in a single match.