Mr Blair said he respected the verdict of June`s referendum, but recommended looking again at Brexit when "we have a clear sense of where we`re going".
He added that the British people could "have a change of mind".
The UK government says it will not provide a "running commentary" on its stance before negotiations for leaving the European Union begin next year.
Mr Blair was prime minister between 1997 and 2007. After stepping down, he served as a Middle East envoy for eight years.
He announced last month that he was winding up most of his commercial ventures to focus on not-for-profit work.
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