Malakai Fekitoa has given Wasps a huge lift by agreeing to join the Premiership club from Toulon.
Judicael Cancoriet is set to have surgery on a torn pectoral tendon but could still return for the Top 14 playoffs.
Clermont Auvergne hammered fellow title hopefuls La Rochelle, who had won 10 of their previous 11 matches.
Racing 92's win over Toulon will not have made pleasant viewing for France coach Jacques Brunel as Teddy Thomas was injured.
Toulouse ended 2018 on a high note, dishing out a crushing defeat to Toulon in one of three Top 14 games on Sunday.
The battle between top and bottom in the Top 14 table stayed true to form, Clermont running out comfortable winners on the road.
The top two in the Top 14 table could not be separated as Clermont Auvergne and Toulouse shared a thrilling draw.
Stade Francais moved up to fifth in the table as Toulon and Racing 92 ran out convincing winners in Saturday's Top 14 action.
Isaia Toeava will undergo surgery on a ruptured rotator cuff in his left shoulder, ruling him out for six months.
Steve Hansen can understand why World Cup-winner Nehe Milner-Skudder has decided to ply his trade in France.