Employers' group IBEC has said the uncertainty around whether or not the UK will leave the European Union is having a knock-on effect on retailers here.
The employer's group is releasing its new monitor for the first quarter of this year - which has found growth is beginning to stagnate.
Supermarkets, convenience stores and petrol stations are all said to be feeling the impact.
Retail Ireland director Thomas Burke said that the impending vote in Great Britain and Northern Ireland is already having an impact.
"A Brexit would potentially lead to the re-introduction of a border on the island of Ireland between north and south," he said.
"It may also include the return of tariffs between the UK and Ireland on trade, and maybe even indeed a potential return of cross-border trade.
"So from a retail perspective, Brexit poses a very real risk to the Irish retail sector."