Playmaker Cobus Reinach has been confirmed as a Montpellier player five months after revealing he will leave Northampton Saints.
Anthony Bouthier has extended his stay with Montpellier a year after joining the Top 14 club.
Benjamin Fall has left Montpellier after six years with the club and is unsure where he will be playing next season.
Nemani Nadolo will be in Leicester Tigers colours next season after the Premiership club lured the former Fiji powerhouse from Montpellier.
Lyon and Toulouse were both winners in Sunday's Top 14 action, with Patricio Fernandez impressing for the former.
At the end of another week of crisis, Saracens had rare cause for cheer as they reached the quarter-finals of the European Champions Cup.
Rhys Carre's early red card made life difficult for Saracens, but they still defeated Ospreys in the European Champions Cup.
There were wins for Lyon and Racing 92 in the Top 14 as Bordeaux-Begles were usurped at the summit.
Handre Pollard missed some crucial kicks on his Montpellier debut while Top 14 leaders Lyon
Rob Baxter's Exeter Chiefs survived a late scare to defeat Sale Sharks and remain firmly on track for the Champions Cup quarter-finals.
La Rochelle's Pierre Bourgarit learned his fate on Wednesday after being sent off for eye-gouging Sale Sharks' Tom Curry.
Sale Sharks saw off a La Rochelle side who were let down by Pierre Bourgarit, as the English team sealed a first European win... Read more
Racing 92, Northampton Saints and Connacht were all winners in Sunday's European Rugby Champions Cup action.
Hooker Guilhem Guirado made a nightmare start to his Montpellier career, suffering a long-term injury on his debut against his former club.
An early red card was decisive as Bordeaux-Begles suffered their second defeat of the Top 14 season.
It was another game and another win for Lyon in Top 14, where Castres were defeated by Toulouse on Saturday.