Munster, Racing 92 and the Ospreys will take on holders Saracens in the pool stage of the 2019-20 European Champions Cup.
Nimes will be the visitors to the French capital when Paris Saint-Germain start their latest defence of the Ligue 1 title.
Lyon booked a Top 14 semi-final against Clermont after a hard-fought 21-16 victory over Montpellier on Saturday.
There will be a new Top 14 champion after Castres missed out on a top-six finish with a final-day defeat to Toulon.
Neither Bordeaux Begles nor Stade Francais can make the play-offs in the Top 14 after suffering painful defeats in the penultimate round.
Handre Pollard has agreed to join Top 14 heavyweights Montpellier and Morne Steyn will return to his homeland to replace the fly-half.
Grenoble look to be heading for a relegation play-off after losing at home to their nearest rivals Agen.
Paris Saint-Germain are enduring a dreadful run of form and Marquinhos says it is unacceptable at such a big club.
The depth of PSG's squad has provided a regular bone of contention for Thomas Tuchel this season and it was no different on Tuesday.
Souleymane Camara scored five minutes from time as Montpellier secured a thoroughly deserved win against a woeful Paris Saint-Germain.