However, Irish Prime Minister Leo Varadkar has said that if a deal can not be completed at this week's European Council summit, EU leaders may have to convene again before the end of the month to continue Brexit talks before the 31 October deadline.
Johnson has assured his European counterparts that he can get the deal through parliament, and French President Emmanuel Macron said he was "reasonably confident" the deal could be ratified.
Johnson has no majority in the 650-seat parliament, and in practice needs at least 318 votes to get a deal ratified.
European Union leaders gave their unanimous backing to a Brexit deal with Britain on Thursday, putting the onus on Prime Minister Boris Johnson to secure the British parliament's approval for the deal in a vote in two days' time.
A summit of EU leaders "endorsed this deal and it looks like we are very close to the final stretch", EU Council summit host Donald Tusk told reporters after the meeting. Johnson, who took office in July vowing Britain would finally leave the European Union on 31 October, come what may, likened Brexit to climbing Mount Everest.
The transition period was originally intended as a two-year period during which the United Kingdom could begin negotiations on future deals, however repeated Brexit delays means that the current transition period is 14 months.
But he has no majority among MPs, and his threat to leave the European Union with or without a deal this month has exacerbated existing divisions in parliament. That makes it, if you like, a form of time-limited backstop - although the European Union would argue that it is highly unlikely that the Assembly would ever vote to trigger such uncertainty.
The long-term future of the Irish border will be in the hands of the people of Northern Ireland through a vote in the Northern Ireland Assembly at Stormont after four years, and then a further four or eight years later.
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Northern Ireland will remain aligned to a limited set of rules related to the EU's Single Market in order to avoid a hard border - legislation on goods, sanitary rules for veterinary controls, rules on agricultural production/marketing, Value-Added Tax and excise in respect of goods, and state aid rules.
Brexit negotiations have been here before - seemingly closing in on a deal that is dashed at the last moment.
It proved a major sticking point for his predecessor Theresa May whose deal failed to pass the Commons three times.
Previously agreed settlement on citizens' rights after Brexit and Britain's divorce bill stay as they were.
The party stated that it "will be unable to support these proposals in Parliament" after the deal was announced.
However, the DUP, which supports Johnson's government, said the new text was not acceptable - a step that could spur hardline Brexiteers in his Conservative party also to oppose ratification.
Mr Corbyn criticised "speculation" when asked about reports that his party could support the deal if it comes with a second referendum.
TRADE: In a non-binding political declaration that accompanies the withdrawal agreement, the two sides promise "an ambitious, broad, deep and flexible partnership across trade and economic cooperation with a comprehensive and balanced Free Trade Agreement at its core".