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A one-time client of high-profile lawyer and former Victorian police officer Michael Kuzilny has accused him of entering a guilty plea against his specific instructions.

Mel Mark Saric claimed he "shrieked ’what"’ at Mr Kuzilny before he then realised Mr Kuzilny had pleaded him guilty to three driving charges at a suburban magistrates court.

Mr Kuzilny on Thursday said Mr Saric’s allegations were ‘‘completely wrong’’.

He told Fairfax Media he had received ‘‘specific instructions’’ from Mr Saric to plead guilty at the ‘‘earliest opportunity’’ because he had no defence to the charges.