England full-back Mike Brown is ready to work his way back to fitness after showing no signs of headaches or pain during the recent training camp.
The 29-year-old was knocked unconscious during England's clash with Italy at Twickenham during the Six Nations but, despite returning for the matches against Scotland and France, Brown was was unable to play for his club Harlequins again.
There were concerns as he battled to recover from ongoing headaches, which caused some pain but refused to disappear. He was eventually told by Quins' medical staff to rest at home, which meant he missed the rest of the domestic season.
But there appears to have been some improvement of late which is good news for England ahead of the Rugby World Cup.
"The headaches seem to have gone now," he told Sky Sports.
"If it was ever going to make a comeback it'd be in the training we're doing. Like 'Wig' (England forwards coach Graham Rowntree) said it's been brutal, it's been tough."
Brown will be part of England's reduced 45-man World Cup training squad who are set to depart for their two-week camp at altitude in Denver, Colorado on Saturday.
Colorado will offer him his first chance to experience physical contact since he played in the Six Nations victory over France as England plan to play inter-squad matches.
"I've been all-clear through that so hopefully the next stage will be to take a bit of contact, which I've got no doubts in my mind I'll be able to do," added Brown.
"I can only speak for myself but if you believe you can put the effort in, get to the level then you'll get picked so that's what I'll concentrate on doing."