"I would have slept very badly if Biarritz had won in Bordeaux," said Perpignan coach Marc Delpoux.
"However, the 7th spot is ours and that's the most essential thing so we can now focus on the Amlin Challenge Cup semi-final against Stade Français in what will be a packed stadium - and hope for a beautiful week-end in Dublin on 17 May."
Perpignan rested Wales star James Hook - who has scored 39 points in five tournament appearances, including 15 in the 30-19 quarter-final victory over Toulouse - against Agen while fellow outside half Felipe Contepomi was guiding Paris to a 19-16 win against Racing Metro 92 at Stade de France.
"We all dream of finishing this season with a final," said Paris coach Christophe Laussucq.
"But we know Perpignan are waiting for us and that it is going to be a very tough game over there. But it is also going to be a very good moment of rugby, a real pleasure.
"We were able to beat Racing Metro 92, who will play in the Top 14 play-offs, with a few players who were discovering the French championship at the Stade de France.
"And most of the players we planned to play in Perpignan are available - perhaps we have finally got a bit of luck…"
Pumas' ace Contepomi added: "I hope we can win this semi-final and hope for a beautiful end to the season. We know what our goal is and we work hard to achieve it."