George North was knocked out by Wasps ' Nathan Hughes last Friday . The England international has been ruled out of the rest of this season after suffering a knee injury in training on Saturday and will be replaced at Northampton by fellow Premiership player Ben Morgan.
George North was knocked out by Wasps ' Nathan Hughes last Friday . He will be given at least a month to recover before returning to action . North has suffered three concussions in the last four months . The Welshman will be reassessed by a neurologist at the end of April .