Vermeulen aggravates neck injury
Vermeulen left the field in the 44th minute after his attempt to prevent Maxime Medard from scoring went horribly wrong.
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Toulon's forwards coach, Jacques Delmas explained that the hard-hitting No.8, who underwent neck surgery in July 2015, was taken to hospital with a head injury.
In addition to Vermeulen's injury, Toulon suffered a further blow in the forwards department after lock Romain Taofifenua suffered a dislocated shoulder.
No further details of the extent of Vermeulen's injury have been made public.