Toulouse finished the Top 14 league in pole position while Racing Metro have done enough to advance to the play-offs.
Toulouse beat Montpellier 20-13 while Clermont smashed Brive 57-14. The winners of these two clashes have booked their respective places in the semi-finals.
Toulon beat Lyon 29-5 to earn home ground advantage in the qualifying play-offs (effectively the quarter-finals). They will host Racing, who lost 25-22 to Agen on Saturday but have still done enough to finish in sixth position.
Castres edged Bayonne 31-29 and will host Montpellier in the other play-off.
Meanwhile, Lyon and Brive have been relegated from the Top 14.