London - Northampton and Wales wing George North will miss Saturday's European Champions Cup quarter-final with Clermont Auvergne after sustaining another head injury during an English Premiership match last week.
North, who also sustained two blows to the head in Wales's Six Nations defeat to England in February, appeared to be knocked out as he scored a try in Northampton's 52-30 victory over Wasps.
"We won't play him at the weekend. Clearly he had a nasty knock," Northampton coach Jim Mallinder told Sky Sports television.