The four times Euro kings held their nerve to triumph 27-20 at the Estadio Anoeta, ensuring they remain on course to become the first team since 2001 and 2002 winners Leicester Tigers to secure successive titles.

Guy Noves’ men will now take on Leinster at the Aviva Stadium on April 30 thanks to replacement Yannick Nyanga’s last-gasp try with just a minute of extra-time left to play.

The replacement flanker charged down a Dimitri Yachvili clearance with the scores tied at 20 points apiece after another incredible all-French affair.

Toulouse had seemed to be cruising to a last-four place after first-half tries from Cedric Heymans and Maxime Medard had seen them race into a 17-0 half-time lead.

But Biarritz hit back to level affairs at 17-17 by the end of normal time thanks to the boot of Yachvili and a late, late try from Llikena Bolakoro.

The flying wing touched down with the last play of the game, leaving Yachvili with a touchline conversion to seal a heroic home comeback.

But the France scrum-half pulled his effort narrowly wide of the posts from the left-hand corner allowing the champions to breathe again.

David Skerla and Yachvilli traded penalties in the two extra 10-minute periods but Toulouse’ better try count left Biarritz needed an extra score to progress.

With just moments remaining in the pouring rain, Yachvili saw his hack downfield charged down by Nyanga, who picked up unopposed to score the match-winning try.