The European Commission said that Johnson's new Brexit proposals do not provide any basis for finalizing a separation agreement, according to Sky News.
Talks on Johnson's plan to replace the Irish backstop will not take place over the weekend, EU Commission spokeswoman Natasha Bertaud was quoted as saying by Sky.
She added that the UK will be given "another opportunity to present its proposals in detail" on Monday.
"If we held talks at the weekend it would look like these were proper negotiations," the Times newspaper had earlier cited an EU diplomat as saying. "We're still a long way from that".
Johnson has consistently said he will not ask for a Brexit delay, reiterating the point on Friday, according to Reuters.
"New deal or no deal - but no delay. #GetBrexitDone #LeaveOct31", Johnson said in a tweet.
However, his government also acknowledged for the first time on Friday that Johnson will send a letter to EU asking for a Brexit delay if no divorce deal has been reached by October 19.
Johnson has not explained the apparent contradiction, with opponents believing he will seek some kind of legal escape route to avoid asking for an extension, or try to pressure the EU into refusing to agree to such a request.
Johnson's top advisor said the government will be observing developments over the coming week, but will not change its negotiating position, The Times reported.
"Next week we are going to know how things turn out," Dominic Cummings was quoted by The Times as telling other advisers.
"If the EU says no then we are not going to do what the last lot did and change our negotiating position. If we don't get anything next week, we are gone."