Speaking at a news conference six months after he took over the chairmanship of Havas, Bollore said "the game was open" for a link up between Havas and Aegis, adding that there was a "certain logic" in merging the firm's media space buying operations.
According to Reuters, Bollore told the conference that: "We have the largest stake in Aegis. We have not invested for nothing, it's a financial stake. The game is open and we are open to reconsidering our position."
However he ruled out raising his stake in Aegis to more than 30%, the trigger point when he must make a full offer, and said he had no intention of gaining a seat on Aegis's board.
At the conference he pledged his future to Havas, saying: "I'm not there by coincidence. I'm not passing through. I'm there for a long time."
He also revealed that the firm, which is struggling to compete with rivals including Publicis and Omnicom Group, is expecting to see a dip in sales and its operating margin.
It forecasts yearly sales of 2005 at €1.41bn (£950m), down from €1.494bn in 2004, and sales for December are set to drop by 10%.
In terms of its operating margin, this is set to be around 10%, compared with 11.5% last year.
Speculation of a merger between Aegis and Havas dates back to August, when Bollore began his stock buying in spree in Aegis, which rose to 25.05% late last month.
Publicis, as well as WPP Group, in collaboration with Hellman & Friedman, were previously in the understood to be in running to buy Aegis but have since ruled themselves out.
Last month, investor David Herro, who is most famous for leading a shareholder revolt against the Saatchi brothers, told the Financial Times that he believes Bollore is the best hope for Aegis.
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