EU ambassadors have agreed to delay Brexit, but will not make a decision on a new deadline date until next week.
The European Commission said work on this would "continue in the coming days".
The talks came after Chancellor Sajid Javid admitted the government's deadline to deliver Brexit next Thursday "can't be met".
Boris Johnson said he was waiting for the EU to decide "what they want to do".
MPs are expected on Monday to consider the prime minister's call for an early general election.
UK Prime Minister Boris Johnson will scrap the vote on his Brexit deal—the Withdrawal Agreement Bill (WAB)—and push for a snap general election, if his program motion is voted down by lawmakers later.
If Parliament "gets its way and decides to delay everything," Johnson told the Commons, "the bill will have to be pulled and we will have to go forward... to a general election."
"I will in no way allow months more of this," Johnson added.
The program motion has come under attack for asking MPs to consider Johnson's Brexit deal in just three days.
The Commons Speaker has refused a government request to hold a "yes" or "no" vote on its Brexit deal.
John Bercow said a motion on the deal had already been brought before MPs on Saturday, and it would be "repetitive and disorderly" to debate it again.
Saturday's sitting saw an amended motion nodded through by MPs, which withholds approval of Boris Johnson's deal until it has been passed into law.
The PM agreed a deal with the EU last week, but it must be approved by MPs.
A Brexit deal has been agreed between the UK and EU before a meeting of European leaders in Brussels.
Boris Johnson and Jean-Claude Juncker called it a "fair" outcome. The EU Commission President said there was no need to extend the Brexit deadline.
He said: "We have a deal so why should we have a prolongation."
This will be a boost for the PM [Boris Johnson], but he still faces a battle to get the deal through Parliament on Saturday, with the DUP opposing it.
Mr Johnson urged MPs to "come together" and "get this excellent deal over the line".
The government of UK Prime Minister Boris Johnson has set out "ambitious" policies on crime, health, the environment and Brexit in a Queen's Speech that opposition parties have dismissed as an "election manifesto".
Plans for tougher sentences for violent offenders and legal targets for cutting plastic pollution are among 26 bills set out at Parliament's State Opening.
But with the PM having no majority, many of the bills may not become law.
Prime Minister Theresa May is to officially notify the European Union next Wednesday that the UK is leaving.
Downing Street said she would write a letter to the European Council, adding that it hoped negotiations on the terms of exit and future relations could then begin as quickly as possible.
An EU spokesman said it was "ready and waiting" for the letter.
Mrs May's spokesman also rejected reports an early election may be held, saying: "It's not going to happen."