Millwall have reluctantly agreed to the EGM called for by their largest shareholder, Graham Lacey.
Lacey, who owns a 28.9% stake in The Lions, wants shareholders to be given a greater say over the club's regeneration plans.
The board at Millwall have twice refused requests for an EGM, claiming Lacey's proposals are "vexatious and ineffective", but will now consider them rather than face a court ruling.
Chief executive Heather Rabbatts said: "Mr Lacey has left us with little choice so we have decided to call a general meeting as this will result in lesser costs than going to court.
"Nevertheless, this is still a highly-damaging exercise we are being forced into and will cost the club many thousands of pounds when we can least afford it.
"As we have repeatedly said, we remain of the view the resolutions proposed by Mr Lacey are both vexatious and ineffective and we are very confident our shareholders, including our 43,000 fans, will support the board and defeat the resolutions, allowing the board to get on with the job that matters - building Millwall into the club it deserves to be."
Millwall winger Chris Hackett has put pen to paper on a new six-month contract at The Den.
The 25-year-old missed the bulk of the season after damaging cruciate knee ligaments in October, but manager Kenny Jackett was keen to tie him to a new contract.
Hackett turned down longer deals from elsewehere to stay with the Lions and prove his fitness next season.
"I've had a lot of support from the management, the fans and the players and now I want to pay that back by performing for Millwall," he told the club's official website.
"I'm confident things are looking up here and that we can be successful next season."