Luke Braid has been knocked out twice already this season and is heading for a two-week rest.
As New Zealand Rugby continues to get to grips with many high-profile concussion incidents this season, Braid's most recent happened in the second half of the Blues' 16-14 win over the Brumbies when he made a tackle in what initially looked an innocuous collision. He was taken off straight away.
His first occurred in the loss to the Hurricanes in Palmerston North when he was kneed in the head by lock James Broadhurst in an act of foul play. Braid was taken off straight off the field and didn't miss a game as the Blues' had a bye the next weekend but now he is likely to have a fortnight off, meaning he will miss not only Saturday's match against the Highlanders but also the next one against the Crusaders in Christchurch.
Jerome Kaino, Tony Woodcock and Josh Bekhuis have also been concussion casualties at the Blues this season, with Highlanders' prop Josh Hohneck serving to put the issue higher on New Zealand Rugby's priority list after he played on despite being knocked out against the Crusaders last weekend.
The organisation will continue a trial in Saturday's match between the Hurricanes and Waratahs in Wellington whereby the match doctor will be given a television in order to check for signs of concussion injuries after collisions.