Leo Cullen's side came away with a nine point victory.
Leinster secured top spot in Pool 3 of the Champions Cup over the weekend.
Leo Cullen's side scored two late tries from Sam Prendergast and Max Deegan to claim a hard fought 22-13 victory away to Bayonne.
Despite the win, there were injuries picked up by Ireland internationals Tadhg Furlong, Robbie Henshaw and Tommy O'Brien.
The victory guarantees their spot in the last 16, where they will meet Edinburgh at the Aviva Stadium.
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