But the Government will press ahead with the first round of Brexit talks two days before the official opening of Parliament.
"If there is the expected positive outcome, it will be at least the start of next week before anything is signed off", a DUP source told Reuters.
But as the first senior royal to discuss Brexit, he claimed companies were eyeing fresh opportunities in non-EU markets once Britain leaves the bloc.
Brexit negotiators will discuss Monday Britain's financial obligations to the European Union as the long, complicated and potentially perilous process of the United Kingdom leaving the bloc finally gets underway.
Speaking as he arrived for a meeting of European Union finance ministers in Luxembourg, he said: "As we go into that negotiation, my clear view - and I believe the view of the majority of people in Britain - is that we should prioritise protecting jobs, protecting economic growth and protecting prosperity as we enter those negotiations and take them forward".
He wouldn't be drawn on whether he supported Britain's continued membership in the single market and said Prime Minister Theresa May's minority government will negotiate in a "pragmatic" manner, striving for a solution that works for both sides.
Dangerous heat wave to scorch the Southwestern US
A less severe heat advisory was issued Friday for the inland cities of Escondido, San Marcos, Poway, La Mesa, El Cajon and Santee. In Southern California, the hottest temperatures will be in the deserts with highs over 110 degrees.
The UK is due to leave the European Union by the end of March 2019.
The spokesman said: "We want to end the anxiety facing four million citizens".
"We are fully prepared and ready for negotiations to start", commission spokesman Alexander Winterstein told reporters. "But the withdrawal and future are intimately linked".
The article states that discussions on a member's withdrawal must "take account of the framework for its future relationship with the Union".
Barnier and British Brexit Secretary David Davis will open the talks on Monday at 11 a.m.in Brussels and they'll continue on Tuesday with top officials from the European Commission and the U.K.'s Brexit department.
Since her gamble on a snap election failed a week ago, May has come under pressure from some in her own party to change her approach to Brexit talks.
Among topics that need to be agreed upon is the status of United Kingdom citizens living and working in the EU, as well as that of European nationals doing the same in Britain.
Nadal: 10th Roland Garros win is 'indescribable'
Rafael Nadal captured his 10th French Open title when he overwhelmed Stan Wawrinka 6-2, 6-3, 6-1 on Sunday afternoon. Wawrinka , who lost a grand slam final for the first time, said he had been beaten by a man at the peak of his game.
First Aust gun amnesty since Port Arthur
It's Australia's first gun amnesty in 21 years - and the last one led to a sea change in Australia's relationship with firearms. In an earlier statement, he said "We are living in a time when our national security environment has deteriorated".
Johnson, McIlroy and Day miss US Open cut
But the world's top three missed the cut - the first time that has happened at a major since the rankings began in 1986. Masters champion Sergio Garcia meanwhile was lurking five off the lead after a two-under-par 70.
List of GOP congressmen found with baseball practice shooter
The wife of the Alexandria, Virginia, gunman said she's shocked about the attack and had no idea what her husband was planning . On Facebook , he posted furious criticism of President Donald Trump and pledged allegiance to Senator Bernie Sanders .
Trump Appears to Confirm He Is Under Investigation
In one memo , Comey said Trump tried to direct him to drop an investigation into former national security adviser Michael Flynn . ABC News reported that Mr Rosenstein has told colleagues privately that he may have to step aside from the investigation.
British inflation rate rises to 4-year high of 2.9 pct
U.S. consumers cutting down on their purchases of motor vehicles and other discretionary spending contributed to the decline. In commodities, oil prices fell more than 1 percent, on the backfoot again on worries about USA oversupply.
Traffic jam at the top at Erin Hills
Not today: Jason Day of Australia shows his anguish at Erin Hills . "I think it's going to produce a really great champion". Casey birdied five holes in a row after the rough stretch and was the first player in the clubhouse at seven-under.