The chief executive of Next Simon Wolfson said a no-deal Brexit would not lead to disorder and chaos as the British government's contingency planning meant the economy was better prepared.
"We are a long way from disorder and chaos," Mr Wolfson told the BBC.
He also said that Next had moved all its imports and exports out of Calais to other ports.
Mr Wolfson, the boss of one of Britain's biggest clothing retailers, has been described as one of Britain's most eurosceptic CEOs and was a vocal supporter of Brexit.
Almost a year ago, Next established an Irish subsidiary as part of its Brexit preparations, as part of which it also said a no-deal would not pose a "material threat to the ongoing operations and profitability" of its business.
Speaking to the BBC today, Mr Wolfson said the government of Theresa May had failed to adequately prepare for a no-deal, a situation he said was now being addressed by prime minister Boris Johnson.
Mr Wolfson said he still hoped a deal would be struck, probably at the last minute.
"In the vast majority of deals I've done, if the deadline is midnight, the deal gets done at 11.55 but we need to have nerves of steel and prepare ourselves for either outcome," he told the BBC.