article_snippet.sent: Northampton wing George North has been advised by leading medics not to play again this season after suffering four quick-fire concussions, while Ireland's Johnny Sexton was stood down for 12 weeks earlier this term.
article_snippet.sent: George North will not play against Clermont Auvergne on Saturday and will see a neurosurgeon .
article_snippet.sent: George North suffered a neurosurgeon fourth quick-fire concussion after being knocked out against Wasps on Friday night . '