Mushroom murderer Erin Patterson will appeal her convictions, but her new lawyer has confirmed he needs more time to file the paperwork.

Patterson’s appeal period was due to expire at 11.59pm on Monday but barrister Richard Edney on Thursday indicated in the Victorian Supreme Court they were not ready to lodge the appeal.

Justice Christopher Beale noted the Court of Appeal’s new practice note where appeal extensions are granted as a matter of course if they’re lodged within 56 days of sentence.

While the paperwork is yet to be filed, Edney said Patterson would lodge an appeal against a jury convicting her of three murders and one attempted murder.

“I can indicate there will be an appeal against conviction,” he told the court.

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The Director of Public Prosecutions is yet to decide whether it will appeal Patterson’s sentence, a spokeswoman confirmed.

Patterson was jailed for life in September with a non-parole period of 33 years after she was found guilty of killing her former in-laws Don and Gail Patterson, 70, and Gail’s sister Heather Wilkinson, 66.

The jury found she deliberately served beef Wellingtons that were laced with death cap mushrooms to her lunch guests in July 2023.

Heather’s husband Ian Wilkinson also ate the meal and fell seriously ill but survived.

Patterson, who this week celebrated her 51st birthday in custody, has always maintained her innocence and claimed it was a terrible accident.

Barrister Colin Mandy SC represented Patterson during her triple-murder trial but Edney will be the one to lead the fight to quash her convictions in the Victorian Court of Appeal.

Edney previously represented Rebecca Payne, who was convicted of murdering her abusive husband by feeding him drug-laced biscuits and locking him in a freezer.

Payne was originally jailed for 16 years but successfully reduced her sentence on appeal down to 12 years.

-with AAP