Two of underworld figure Tony Mokbel's convictions must be set aside because barrister-turned-informer Nicola Gobbo's improper actions "infected" the cases, an appeal court has ruled.

Mokbel, 60, walked jovially into the Victorian Court of Appeal on Friday morning, hoping all three of his drug trafficking and importation convictions would be quashed.

But justices Stephen McLeish, Maree Kennedy and Stephen Kaye only ruled in his favour on two convictions - known under the police operation names Quills and Orbital.

They found Ms Gobbo, who was a registered Victoria Police informer, encouraged two of her clients to "roll" against Mokbel and give statements to police.

At the same time, she was representing Mokbel in court or providing him with legal advice.

Police relied on the evidence f

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