Biarritz earned their ticket into this season's Heineken Cup as the 2012 Amlin Challenge Cup winners and now the challenge is to repeat that feat.
But the first test ahead of any thoughts of the Friday, 17 May final back at the RDS comes in the shape of triple Heineken Cup champions Leinster - and Peyrelongue accepts the home club will be favourites.
"We are not favourites for this semi-final," said the former international poised to play his 79th European match.
"But everybody saw us losing in Gloucester three weeks ago, notably knowing that they had just beaten Harlequins, but we are the ones in the semi-finals.
"However, you do not get to play matches like this every day and for us it is the only means to be able to still take a place in the Heineken Cup. But it would be a huge feat to beat Leinster and even after that it would be necessary to earn victory in the final.
"I remember that in the 2003 Heineken Cup quarter-finals we came come back at the end of match against Leinster before we bowed out 18-13 and we know really well that Leinster have become a very big European club.
"They offer interesting things and are very hard to overcome. To win, it will be necessary to make a big match and especially not to make mistakes."