And while triple Heineken Cup champions Leinster have never lost a European final Stade have to end a three final losing run.
They suffered heartbreak in the 2011 tournament final in Cardiff when Harlequins edged them out 19-18 - and that followed the agony of two Heineken Cup final defeats, 34-30 to Leicester Tigers in 2001 and 18-12 after extra time to Toulouse in 2005.
"We are going to have to defend exceptionally well if we are to have a chance," said Rabadan. "Leinster are a team capable of holding the ball for 10 to 15 phases and they have some very big players in the backs.
"It will be necessary to disrupt them in launching their game. We discussed it with Biarritz players after their quarter-final against Leinster and they confirmed that Leinster are able to speed up their game in an instant.
"And in view of Leinster's results over the last few seasons no-one can say that this looks like a 50-50 match.
"They are triple European champions and are in the Amlin only because they were in the same Heineken Cup group as Clermont.
"If you drew up a balance sheet over the last five years then Leinster would be the best team of Europe. On top of that we are going to play away from home, in their stadium, therefore it is really a huge challenge ahead of us."