The Irish province have won four of their six Champions Cup finals but face a La Rochelle side to have beaten them behind closed doors last year.
La Rochelle have never won a European trophy but made the final last time out, losing to Toulouse.
They have overcome a slow start and coach Ronan O’Gara believes his team are in a much stronger place mentally to last year, looking to take that experience into today’s game.
Here’s how to keep across all of the action.
How to watch Leinster vs La Rochelle
TV channel: In the UK, the game will be shown free on Channel 4 with coverage from 4:15pm BST. BT Sport 2 will air coverage from 4pm BST.
Live stream: Both the All 4 and BT Sport apps will offer live stream services.