Brisbane's trip to the Tribunal was unsuccessful in dismissing Charlie Cameron's three-match ban and will miss clashes against Sydney, Gold Coast and St Kilda.
Cameron was offered a three-match suspension from the Match Review Officer (MRO) for a dangerous tackle on West Coast co-captain Liam Duggan during Sunday's clash at Optus Stadium.
The MRO graded the incident as careless conduct, severe impact and high contact, constituting a three-week layoff.
As a result, Duggan was concussed and has entered the mandatory concussion protocols, ruling him for at least 12 days.
Cameron - in his second visit to the Tribunal this year (the previous was Round 5 for a tackle on Jake Lever) was joined by Brisbane's counsel Adrian Anderson, who contested the rough conduct charge "because his actions were not unreasonable" in the tackle.
Cameron gave evidence during the hearing, declaring: "I'm just trying to hold the tackle up and just trying to control the tackle."
"I've lost my footing due to him fighting the tackle ... that caused the imbalance for me to leave my feet.
"It (the head clash) was accidental due to the momentum he created.
"I think if I let him go or don't make a tackle, I'd be in trouble I guess ... it's not a good look defensively."
AFL counsel Lisa Hannon attempted to establish that Cameron continued to drive the tackle well past the initial contact.
"In continuing to move forward, you wanted to take him (Duggan) to ground to complete the tackle."
Hannon suggested that Cameron could've released Duggan's right arm to potentially avoid the heavy knock to the ground and "brace for impact when he fell".
Hannon also made note that Cameron "could've attempted to slow momentum at the top of the tackle or sit Duggan down rather than driving forward with force".
Anderson (Brisbane) contended that there were five reasons that Cameron wasn't acting unreasonably in the contest.
1 - Cameron elected to tackle and not bump.
2&3 - Attempted to do the right thing and stand up in a tackle, planting feet to stabilise the contest but got taken from underneath him.
4 - No need for Cameron to "sit down" in tackle (AFL suggestion); he tried to remain standing.
5 - Releasing the right arm (AFL suggestion) would've made no difference to the outcome.
The Tribunal didn't agree, suggesting Cameron could've altered his actions in a reasonable way to assist in preventing the outcome.
Cameron will miss three next three matches, including the important clash with ladder leaders Sydney.