The former Prime Minister said the British public could "have a change of mind"
Former Prime Minister Tony Blair has said the UK should keep its "options open" over Brexit, including a second referendum.
Speaking to the BBC, Mr Blair called the vote a "catastrophe" and that the "real-life implications" of the vote must be examined.
While he said he accepted the verdict of June's referendum, he recommended looking again at Brexit when "we have a clear sense of where we're going".
In June, 51.9% of people voted in favour of leaving the EU.
"If it becomes clear that this is either a deal that doesn't make it worth our while leaving, or alternatively a deal that's going to be so serious in its implications people may decide they don't want to go, there's got to be some way, either through Parliament, or an election, or possibly through another referendum, in which people express their view," he added.
Following the interview, UKIP MP Douglas Carswell tweeted that Mr. Blair was "seeking to de-legitimise and reverse" the referendum result.
Tony Blair sides with those is SW1 and at BBC seeking to delegitimise and reverse referendum result https://t.co/6STrxog54V— Douglas Carswell MP (@DouglasCarswell) October 28, 2016
The government has promised to invoke Article 50 - setting formal talks with the EU in motion - by the end of March next year.
It says it will not provide a "running commentary" on its stance before negotiations for leaving the EU begin but has pledged to make Brexit work for the whole country.
Governor of the Central Bank of Ireland Philip Lane outlined the effects Brexit will have on Ireland today, saying Brexit represents a "major downside risk" for the Irish economy