Wales and Northampton Saints wing George North says he is through his concussion problems and has been cleared to resume full training.
North, 23, has been named in Wales' 47-man training squad for the tournament, despite not playing since March because of a series of head injuries.
The 2013 British and Irish Lion told the BBC he has passed all his cognitive tests and is "feeling a lot better".
"I'm allowed to start training fully," he added.
"But there's no rugby to be played so it's a bit of a blessing that I won't take contact for another few weeks now, which is even better for my recovery.
"It is frustrating, but it's not been a bad frustration because you know you have only got one head."
North missed the Saints run-in which ended in defeat in the Premiership semi-final at home to eventual champions Saracens.
The Welsh star's last appearance for the club was on 27 March in the 52-30 home win against Wasps.
North was knocked unconscious as he scored his second try of the match.
It was North's fourth head injury in five months and he was given a period of rest following medical advice.
But North says the Saints have treated him well.
"Northampton have been amazing with me from minute one," he said.
"When you only have one head you don't mess around with that.
"I myself sometimes forget I am 23 years old. In the grand scheme of things what's missing two or three weeks more rugby to get an extra few years at the end of your career?
"For me it's been massively frustrating to miss big games, but at the end of the day your health and wellbeing come before rugby."