text: England full back Mike Brown is still showing signs of concussion and may not play again until the World Cup warm-up matches in August. Nine weeks after being knocked out in the RBS 6 Nations Test against Italy, Brown is still suffering from headaches and has taken no part in training or team meetings since he returned to Harlequins. Conor O'Shea, Harlequins director of rugby, has ruled the 29-year-old out of Saturday's Aviva Premiership match against Sale and he is not expected to face Bath the following week. England star Mike Brown could miss the rest of the season after failing to recover from concussion . Brown was taken off after clashing with Italy's Andrea Masi during the Six Nations match in February . Brown has continued to suffer headaches nine weeks after his injury and has been advised not to play . 'He has headaches throughout the day,' explained O'Shea. 'He's frustrated because he wants to help his team-mates. What's even more frustrating is he can't contribute in meetings. He can't even be in the room to help people because we're sending him home to get himself right. I want to see Mike Brown right when he is in his 50s, not when he is in his prime.' Brown was knocked cold in an accidental collision during England's 47-17 victory over Italy at Twickenham in February and forced to leave the field. He missed the next game against Ireland but played against Scotland and in the championship decider against France after which he admitted he 'didn't feel quite right'. Assuming Harlequins do not reach the Champions Cup play-offs, Brown's last chance to feature before the end of the season will be in the final-round fixture against Newcastle. 'You can't rule out the possibility that he might not play again this season,' said O'Shea. 'Do I think he'll be right for Bath? I don't think so. Do I think we're looking at Newcastle? Yes, but if he's not right then, he's not right.' Feb 14: Knocked out in 13th minute of England's RBS 6 Nations fixture against Italy following huge collision with Andrea Masi. Feb 25: Ruled out of England's Test against Ireland after failing to come through the necessary safety tests. Mar 14: Played 76 minutes in England's Calcutta Cup victory over Scotland. Mar 21: Played full game in England's final-round victory over France. Mar 23: Stood down by club medical staff on day of his return to Harlequins. Cleared to have a week-long holiday in Dubai to aid recovery. Mar 28: Sidelined for Aviva Premiership match against Saracens. Apr 11: Sidelined for Aviva Premiership match against Gloucester. Brown, who is not even allowed to train on an indoor bike until he is symptom free, is England head coach Stuart Lancaster's first-choice full back going into the World Cup and O'Shea backs the player to regain his form quickly. England play a double-header against France in August, before facing Ireland in their third and final warm-up fixture in September. 'He'll have the World Cup warm-ups and he'll be fine,' said O'Shea. 'The World Cup is not an issue at all. Mentally, Mike Brown is unflappable and will just get on with it. With your England hat on, you might say this enforced break is the best thing for his limbs. What he's been told to do is take complete and utter rest. We normally have to pull him away from extra training but he'll look back on this window and learn from it. 'He will not undergo a normal return to play procedure now — it will be a more extensive procedure. It's not about Quins; it's about Mike. As a club, we've looked after the player and didn't have a second thought about standing him down the Monday he came in. This isn't like the old days — it's not a badge of honour to play on any more.' Harlequins director of rugby Conor O'Shea says that he does not blame the England for Brown's injury . Having played only six of Quins' last 19 fixtures, brown will gain valuable game time in the England preparation games. It raises the question as to whether he was rushed back too early, although O'Shea does not lay any blame at England's door. 'I'm not remotely frustrated at them,' said O'Shea. 'Mike was honest enough to pull himself out from the Irish game and everyone has a duty of care towards the player. 'Even a slight intimation that anyone does not look after the player's best interests is just wrong.' Brown breaks clear to score the opening try for Harlequins against Bath at Twickenham last year .
target: Harlequins and England full-back Mike Brown may not play again this season due to on-going concussion issues .
  The 29-year-old has not played since returning from international duty last month after being knocked out in a Six Nations game against Italy .
  Nine weeks later, Brown is still suffering from headaches and nausea .
  Harlequins director of rugby Conor O'Shea has insisted that he does not blame the England set-up for Brown's injury .