Business leaders say they are more concerned about skills shortages, economic growth and whether to invest in staff or equipment than whether the UK should leave the EU.
The head of the CBI and the chairman of finance giant EY said there was little discussion in boardrooms about a possible Brexit.
Steve Varley of EY said company directors were more likely to discuss Europe when they leave work.
Firms are more exercised about good quality economic growth, a shortage of skilled workers, especially in IT, and investment decisions, he said.
CBI director general John Cridland agreed, saying his members had many other concerns.
Speaking ahead of the CBI'S annual conference on Monday, Mr Cridland said most of his members wanted to remain in a reformed EU.
The CBI will consult firms on their position once the Prime Minister announces the outcome of his bid to achieve reforms to the UK's membership.
Mr Cridland said business wanted more free trade deals such as the one under negotiation between the EU and the United States, and fewer employment and consumer regulations.
He will tell the conference next week that many issues need resolving, including Britain's place as Europe's financial capital outside the euro zone.