It is understood that Havas has nominated three people to join its 13-strong board, with another three up for re-election. This will make a total of 16, two short of the maximum 18-strong board that French law allows.
Bollore has demanded four seats on the board to equal his 20% holding in the company.
It is a call that has not been met by Havas chief executive Alain de Pouzilhac, who last week accused Bollore of waging a 10-month campaign of destabilisation.
De Pouzilhac has refused to sanction Bollore's calls for seats on the board and charged him with acting as if he controlled Havas.
He pointed out that his 20% share in the company was not more important than the 80% owned by other shareholders.
"Is Vincent Bollore an industrialist or a raider? Does he want to develop, cut up or to resell Havas? I really am incapable of answering," he said.
However, if Bollore does not get his seats on the board, speculation is that he could sell his stake in the group, which owns the advertising agency Euro RSCG and media agency MPG.
If he does sell, this could well put Havas up for grabs and spark a possible bidding war for the company. There has been much speculation about how long Havas can survive as one of the last mid-size advertising holding firms.
Its former peers, including Tempus and Grey Global Group, have all been acquired, leaving just Havas, which lost out in its efforts to buy Grey to the WPP Group.
According to a report in The Wall Street Journal, at least two investors, Proxinvest in France and Institutional Shareholder Services in the US, have sided with Havas.
"We didn't think the dissenters were forthcoming with a plan that warranted the removal of the existing directors," Stanley Dubiel, managing director of international research at ISS, told the WSJ.
Havas' annual general meeting takes place on June 9.
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