French club Bayonne have signed England-capped back Mathew Tait and All Black Tom Taylor.
Bordeaux came back from an 11-point deficit to defeat Toulon 28-23 in the Top 14 at the Stade Chaban Delmas.
Clermont and Stade Francais both suffered losses in the Top 14, leaving them locked together with new leaders Toulon.
Toulon put their Steffon Armitage woes to one side to beat Bayonne 24-17 in the Top 14 on Friday.
Newcastle, Exeter, London Irish, Cardiff and Connacht recorded bonus-point wins in the Challenge Cup.
France full-back Scott Spedding will leave Bayonne to play for Clermont next season.
Jake White's first game in charge of Montpellier ended in a win over Toulon, while Stade Francais hung on to top spot.
Stade Francais shocked defending champions Toulon 30-6 to end the year at the summit of the Top 14.
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