Aggregate and construction material supplier
In a media report, he said that while the prospect of countries leaving the eurozone was "hopefully unthinkable", CRH was preparing for such an eventuality and had plans in place "as any responsible company should".
CRH previously indicated that it was working on strategies to deal with a Eurozone break-up.
Lee was speaking in an interview with Bloomberg televisionas CRH prepares to shift its primary stock market listing to London from Dublin next week.
He said that continued uncertainty in Europe had weighed on the company's operations, with a moderation in like-for-like sales growth, adding that while he was hoping that the latest summit of European leaders would deliver a final resolution to the ongoing debt crisis, he was concerned about what a failure to do so would mean.
"We're concerned that if the European authorities don't get ahead of markets on this, that it could have a negative effect on demand in the Eurozone in 2012."
