The UK government has said rules allowing EU nationals to live and work freely in the UK will end in the event of a no-deal Brexit on 31 October.
Theresa May's government had considered extending freedom of movement to 2021 or allowing EU citizens to stay in the UK for three months before having to apply for a longer stay.
However both those options have now been dropped, in favour of a new approach which will be set out later.
About 3m EU citizens live in the UK.
Freedom of movement allows EU citizens to live and work in other European Union countries.
Asked about the issue, Prime Minister Boris Johnson said the UK would not "become remotely hostile to immigration or immigrants".
He added that "immigration into the UK will be democratically controlled."
The Three Million group, which campaigns for the rights of EU citizens living in the UK said: "Ending freedom of movement without putting legal provisions in place for those EU citizens who have not yet successfully applied through the settlement scheme will mean that millions of lawful citizens will have their legal status removed overnight."
A Downing Street spokeswoman reiterated the government's desire for an Australian-style points-based system.
She also added that "tougher criminality rules" for those coming to the UK will be introduced.
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