A landmark concussion class action against the AFL and Geelong has been cleared to proceed, as the Cats were warned they could have up to 300 players who suffered brain injuries.

In a major ruling released by the Supreme Court of Victoria on Wednesday, the AFL and the Cats were told they had failed in a bid to limit or quash the concussion class action brought by former Geelong premiership star Max Rooke , which has at least seven Cats players involved.

The ruling was in response to a June 17 hearing.

Justice Andrew Keogh said lawyers representing Rooke would amend their initial writ, and the group definition in the statement of claim, which will provide greater clarity on who can join the class action.

Margalit Injury Lawyers managing principal Michel Margalit said the ruling was a

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