The Eels’ off-field dramas have taken another twist with director Mario Libertini resigning from the board of the Parramatta Leagues Club on Thursday night.

The exit of Libertini came on the eve of Friday’s PLC board meeting, which will discuss the club’s fresh internal investigation into tampering of memberships as well as this month’s farcical annual general meeting. Fairfax Media on Wednesday reported the inquiry had so far uncovered systematic backdating of up to 150 memberships in the lead-up to last year’s PLC elections. It was also revealed the Eels’ archives storeroom near the Leagues Club was broken into last week, with police called over suspected stolen records.

Former Parramatta chairman Roy Spagnolo. Credit:Simon Alekna

Parramatta chairman Steve Sharp has labelled the tampering of memberships, allegedly for vote-stacking purposes, as disturbing and vowed to press on with an investigation and support the involvement of ‘‘relevant law enforcement authorities’’. Among the memberships found to have been entered into the database and backdated by three years over a two-day period in April last year were many associates, friends and family of former chairman Roy Spagnolo, including six people with the same surname. There were also three members of the Libertini family.

PLC chief executive Bevan Paul told Fairfax Media this week the Eels’ probe had not determined who was behind the tampering, found to have taken place on club computers mainly in the three-hour period between 6am and 9am when the Leagues Club is not open. There is no suggestion of any wrongdoing on the part of Libertini, and he said on Thursday night he was departing from both the PLC and Parramatta District Rugby League boards due to increasing work commitments.