Reported by Tim Mitchell
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Sports lawyer and VFL commentator Darren Boyd said Lambert could mount a legal challenge on two fronts - against the VFL's transfer rules and the Northern Blues.
"He would have to prove to a court that the rules are uncompetitive and therefore unlawful as a restraint of trade," he said.
Boyd said Lambert could argue that he is a "free agent" and should be able to move clubs to further his career.
Boyd said Lambert could argue the Blues' call to block his move had been a restraint of trade because he was considered one of the competition's premier players and a strong chance to be drafted to an AFL club in future.