The French outfit beat Harlequins 16-7 to win Pool 1 in their first season in the competition to reach the last eight. Scarlets won Pool 5 thanks to their fantastic 30-27 home win over Toulon, which earned them their first quarter-final in 11 years.
The quarter-finals will be played on the weekend of 30 March and the winners of the game at Parc Y Scarlets will then face the winners of the game between Leinster and reigning champions Saracens in the semi-finals.
Champions Cup Quarter Finals
Leinster v Saracens
ASM Clermont Auvergne v Racing 92
Munster v Toulon
Scarlets v La Rochelle
There is also a Welsh region through to the quarter-finals of the Challenge Cup. Cardiff Blues picked up their second win in France in their 21-18 Pool 2 win in Lyon. They had won the Pool a week earlier after completing the double over Toulouse and will now travel to Edinburgh to face their fellow Guinness PRO14 side in the last eight.
Challenge Cup Quarter Finals
Pau v Stade Francais
Newcastle v Brive
Connacht v Gloucester
Edinburgh v Cardiff Blues
Cardiff Blues won the Challenge Cup in 2010, when they beat Toulon in Marseilles 28-21, and will go on to meet either Pau or Stade Francais Paris in the semi-finals if they can win in the Scottish capital.