Sale and Worcester have been drawn in the same pool for next season's Amlin Challenge Cup.
A losing bonus point for Montpellier in Bayonne was enough to eliminate Perpignan from the race for the play-offs.
Second takes on third in the pick of the Top 14 fixtures with Clermont set to entertain Toulouse on Saturday.
A last-gasp try from Vincent Clerc saw Toulouse claim a 27-26 win over Racing Metro, ending the Parisians' winning run.
London Irish have signed hooker Michael Mayhew from Newcastle and he will leave the Falcons at the end of the season.
Toulon ran in six tries in a comprehensive 50-15 thumping of Biarritz at the Stade Mayol in the Top 14 on Saturday.
Top 14 leaders Toulon host Biarritz this weekend before fourth-placed Castres face the unenviable task of travelling to Clermont.
Clermont notched up a bonus-point win over Stade Francais while Toulon beat Toulouse in Saturday's Top 14 action.
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