His words came after Reuters claimed diplomatic sources have said that a Brexit deal is “very close”.
The unhelpful intervention by Mr Juncker follows widespread criticism over the EU’s approach to the talks after the Salzburg get together of EU leaders where European Council President Donald Tusk went out of his way to insult Mrs May on social media.
Brexit department sources in Whitehall tonight poured cold water on the claims that a deal is close.
A senior source suggested that some people are “getting a bit carried away.”
The source added: “We are still working to the October European Council deadline but I couldn’t tell you how likely that is.”
Addressing the Austrian parliament, Mr Juncker said: “Negotiations are not easy because we also have to be critical that we receive different signals from London.”
“There is a polyphonic chorus at the level of the British cabinet and we try to arrange the pieces so that they become a melody,” he said.
He said he hoped the European Council later this month would make “enough progress” that “we can see it through in November”.
There was speculation last nightFRI that Britain may be willing to take up the offer from Mr Tusk of a so-called Canada plus plus plus deal.
He said: “From the very beginning, the EU offer has been a Canada+++ deal. Much further-reaching on trade, internal security and foreign policy cooperation.
“This is a true measure of respect. And this offer remains in place.”
Tory Brexiteer MP Jacob Rees-Mogg said that the solution will work if there is a deal on the Northern Ireland border which means it is not separated from the rest of the UK.
The leader of the European Research Group (ERG) said: “This is a good solution for everyone and the ERG’s proposals for the Irish border mean it could work for the UK as a whole.”