"It's unlikely. I mean, we really want to see who this person is going to be. And if it's an acceptable person, we will vote for the affirmative. If it's an unacceptable person, in all likelihood we will vote no. So we have not decided how we're going to vote. It really does depend on who the CEO's going to be," he told CNBC on Tuesday.
Harris Associates owns around 6.4 percent of Holcim shares. Herro said the yet-to-be-named CEO of the merged company would not need to come from the cement industry, but would need to be someone "skilled at integrating businesses".
"The problem with the cement industry has been too much capacity, and thereby driving down returns on those assets, and what you need is someone who can unemotionally go through the asset base and make sure that the most-efficient assets are used, the best people are chosen to run those assets, and in as non-political fashion as possible. And so you need an integrator and an operator," he said.
Herro added that he was happy the prospective chief executive was no longer Lafont.
"The proposed CEO was changed and that to me, again, was a positive, because the original proposed CEO was not skilled in the things that I just described, in terms of integration, and running assets, and operating the assets," Herro said.