Oyonnax suffer Vainikolo blow
Vainikolo sustained a ruptured anterior cruciate ligament in his right knee in the 12-25 defeat by Stade Francais in Top 14 action on December 30 and went under the knife on Friday.
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Oyonnax are 13th in the Top 14 and host Ulster in the European Cup on Saturday, bidding for a first win in the continent's showpiece club tournament.
Agence France-Presse