Over 100 AFL players have launched a class over concussions they suffered during their time in the case.

Concussion campaigner and player manager Peter Jess told Tom Elliott it was time for the AFL to make changes to concussion protocols on game day and at training during the week.

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“It starts with trying to understand the biomechanics of our game,” he told Tom Elliott on 3AW Drive.

“The reason we have brain damage is collide repeatedly at speed, this means we have to manage training regimes.”