Molson's chief executive is not sure whether shareholders will support the proposed merger with Adolph Coors, according to press reports.

In an interview with the Globe and Mail newspaper, Dan O'Neill said that he does not know whether class A non-voting shareholders will approve the deal. The merger, which would create the world's fifth-largest brewer by volume, requires the approval of both Molson's class A non-voting and class B voting shareholders.

With Molson's chairman, Eric Molson, controlling more than 50% of the class B voting shares, the fate of the merger seems to be up to the non-voting shareholders.

"I think the overall feeling that we have is there's still a lot of scepticism for the principal reason that people feel there will be another offer coming," O'Neill told the newspaper.

Speculation has mounted in recent weeks that Ian Molson, Eric Molson's cousin and former deputy chairman of Molson, will come back with a higher offer.