Michel Barnier has said a Brexit deal is possible within six to eight weeks.
The EU’s chief negotiator said it was “realistic” to expect an agreement on the terms of the UK’s exit from the EU by early November at the latest.
His comments come amid unconfirmed reports a one-off summit of EU leaders could be convened in the middle of November to sign off the agreement.
Meanwhile, Theresa May has been warned she faces a mass Tory rebellion if she persists with her Chequers plan.
Former Brexit minister Steve Baker said as many as 80 Tories could oppose her plan for future relations with the EU in a Commons vote later this year.
The UK and EU are hoping to finalise the so-called divorce agreement and agree a statement on their future economic co-operation in time for an EU summit in mid-October or by the end of the month at the latest.
Mr Barnier has said this is vital if the UK and EU Parliaments are to have enough time to consider and vote on the proposals before the UK’s scheduled departure on 29 March 2019.
But senior Tory Brexiteers are continuing to urge the PM to change course, saying proposals agreed by her cabinet in July – which would see the UK follow EU rules on trade in goods – will not be backed by Parliament.
Mr Baker said the party risked a “catastrophic split” if the PM didn’t rethink her approach, which he suggested many MPs – including some who backed Remain – thought was worse than staying in the EU as it would leave the UK without any say in its rules.
A key argument that has been made by MPs opposed to the Chequers deal in recent weeks is that the EU will not accept it, since it seeks different levels of market access and obligations for goods and services.
After meeting Mr Barnier last week, Brexiteer Jacob Rees-Mogg said the Frenchman’s views were closer to his than those of the prime minister while Labour MP Stephen Kinnock claimed he told him and other MPs that, referring to the Chequers plan, “les propositions sont mortes”.
But asked about this at a business forum in Slovenia, Mr Barnier said this was not true. “I never said that, I don’t think that. It is not my feeling.”
He described the Chequers plan as a “very important” document and suggested the EU was now “benchmarking” it against the mandate it had been given by the EU’s 27 other members.
“It is useful because it clearly defines what the wishes are for the UK for future relations.”
Mr Barnier said there was “many, many points of convergence” between the two sides, particularly over defence and security and a deal on the terms of withdrawal could be settled within six to eight weeks.
But he warned that the UK’s core proposals for trading relations after it leaves were a direct challenge to the founding principles of the EU and the integrity of the single market.
“It is not possible to get freedom for goods without freedom for services, in particular for the movement of people,” he said.
Following unconfirmed reports last week that Germany had dropped key objections to the UK’s approach, the Financial Times claimed the EU was prepared to begin discussions on the details of Mrs May’s plan.
The paper reported Mr Barnier would be given the green light to begin talks at a meeting in Salzburg later this month while the Guardian suggested the EU might use the occasion to also announce an extraordinary meeting of EU leaders in November to nail down the final agreement.
The talk in Brussels among senior EU officials is increasingly of a special Brexit summit in the week commencing 12 November, if as is widely expected, a deal can’t be struck in October.
The Chequers agreement led to the resignations of then-Brexit Secretary David Davis and the former Foreign Secretary Boris Johnson, both of whom have continued to criticise the direction of government policy.
Mr Johnson caused controversy over the weekend with a column in the Mail on Sunday, calling the PM’s plan a “suicide vest” around the UK, with the detonator in Brussels’ hands.
No 10 has said its plan was the “only one on the table” able to deliver on the will of British people while avoiding a hard border on the island of Ireland.
Asked when Brexiteers outside of the government would come up with a detailed alternative, former Tory leader Iain Duncan Smith said he and others would be putting forward a “whole set of new ideas” in the coming weeks but it was up to ministers to mould them into a plan that would be approved by Parliament.
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