However, Kirwan was clear in his message today after his team trained to take on the Highlanders in Dunedin on Saturday.
"It's a doctor issue and we need consistency around a whole lot of things with Sanzar at the moment. We need to get some consistency on the ruling on concussion."
New Zealand Rugby is undertaking 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.
For the Blues, Luke Braid is another concussion casualty after he was knocked out in the 16-14 victory against the Brumbies at Eden Park. Braid, who was also knocked out in the match against the Hurricanes in Palmerston North, will miss two weeks at least.
Blues team to play the Highlanders at Forsyth Barr Stadium on Saturday, kick-off 7.35pm is: Charles Piutau, Frank Halai, Pita Ahki, George Moala/Francis Saili, Melani Nanai/Tevita Li, Dan Bowden, Jamison Gibson-Park, Jerome Kaino (c), Brendon O'Connor, Akira Ioane, Patrick Tuipulotu, Josh Bekhuis, Angus Ta'avao, James Parsons, Ofa Tu'ungafasi. Reserves: Keven Mealamu, Tny Woodcock/Sam Prattley, Charlie Faumuina, Hayden Triggs, Blake Gibson, Jimmy Cowan, Ihaia West, Francis Saili/Hamish Northcott.
Highlanders: Ben Smith, Waisake Naholo, Malakai Fekitoa, Jason Emery, Patrick Osborne, Lima Sopoaga, Aaron Smith, Nasi Manu (c), James Lentjes, Elliot Dixon, Joe Wheeler, Mark Reddish, Josh Hohneck, Liam Coltman, Kane Hames. Reserves: Ash Dixon, Brendon Edmonds, Pingi Tala'apitaga, Tom Franklin, Dan Pryor, Fumiaki Tanaka, Marty Banks, Richard Buckman.