Aegis has said privately that it has backing from investors totalling as much as 40% of the company, including the support of the National Association of Pension Funds, compared with the Havas chairman Bollore, who owns 29.12% of Aegis.
Aegis has fought an aggressive battle against Bollore telling shareholders that his bid represents a conflict of interest.
Bollore is trying to install Philippe Germond and Roger Hatchuel as non-executive directors on the Aegis board, echoing his moves prior to taking control of French advertising company Havas.
It is expected that Bollore will be in London on Wednesday to attend the meeting. He argues that as the largest shareholder he deserves representation on the Aegis board.
In an open letter to Lord Colin Sharman, Aegis chairman, last week Bollore accused the Aegis board of creating "a troubled phase in its history, which could destroy value".
"It is a basic principle of company law: shareholders who invest and risk their money ought to be able to be represented on the board," he added.
In an interview with The Sunday Times, Bollore told the paper said he would probably requisition an extraordinary general meeting at Aegis if his moves to get board seats was beaten.
"This is a democratic point. If I do not get the representation I want, I will hire lobbying firms, I will go to shareholders to explain, and I will force a meeting. That is my right," he told the paper.
In the letter, Bollore wrote it was not in the UK group's interest to "enter into conflict with its largest shareholder".
Aegis, which owns Europe's largest media-buying firm Carat and a fast-growing market-research arm called Synovate has been surrounded by bid speculation since Bollore began stake-building.
Last year, WPP and Publicis, two of the world's biggest marketing-services firms, walked away from Aegis without tabling firm bids.
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