Four of five executives here say the Government is not providing adequate information to prepare for Brexit.
This is according to a survey of 400 companies carried out by the accountancy firm, BDO.
It comes after the Government appointed a go-to minister for Brexit issues in the form of Foreign Affairs Minister, Simon Coveney.
In many ways, Brexit is still an unknown quantity as negotiations will not kick off until next week.
But many will be hoping that the outcome of the UK election last week will deliver a softer Brexit than might have been the case before.
BDO's managing partner, Michael Costello said that almost 80% of companies are reporting inadequate information to allow them to prepare for Brexit.
"This is partly because the complications surrounding the negotiations are not yet widely understood. There is clearly an information gap and uncertainty. The sooner these are addressed, by the lead negotiators, the better. It is an evolving situation, but businesses are calling for clarity," he said.
Despite ongoing uncertainty regarding Brexit, the survey from BDO found that companies were still optimistic about their business activity and their operational profit compared to this quarter last year.
BDO's "Optimism Index", which has been tracking business sentiment on a quarterly basis since 2011, showed that optimism is down marginally from this point last year.
It slipping from 66.7 last year to 65.9 this year, but this was still a 15% improvement over the last four years.
Business activity slipped slightly back compared to this quarter last year but remains in very positive territory overall.
But the survey showed some signs of caution with 80% of companies said they expect their employment levels to remain static this year.
There was also a 5% drop in the number of companies expecting higher operational profits, compared to the same quarter last year.