Mnangagwa also took to Twitter, calling for calm and urging patience before the results were announced.
The general election follows the ousting of long time Zimbabwean leader, Robert Mugabe in November a year ago by the military.
The EU's assessment is critical in determining whether Zimbabwe can fix its image and attract the foreign investors needed for an economic revival.
Zec has announced some of the results in the parliamentary elections but says it needs time to pull together the figures for the presidential poll from across the country.
On Wednesday afternoon, riot police were stationed outside the electoral commission in the capital, Harare, where a crowd of opposition supporters gathered to await the results.
Zimbabwe's opposition party has declared that their presidential candidate Nelson Chamisa won yesterday's election, despite no official results being released.
Voters traditionally pick a presidential candidate based on their party affiliation and the trend in the parliamentary election was expected to continue when results for the president are announced this week.
He has repeatedly accused ZANU-PF and election authorities of trying to use a flawed electoral register and fixed ballot papers to steal the election.
MDC supporters are blaming the Zimbabwe Electoral Commission for delaying the announcement of the presidential results and declaring their leader‚ Nelson Chamisa‚ as the victor.
The vote attracted a high turnout of 70% and was monitored by worldwide observers.
Election observers from the Southern Africa Development Community (SADC) bloc said the vote was peaceful and orderly and opened the door to strengthen the country's democracy.
"A truly level playing field was not achieved", European Union chief observer Elmar Brok said, pointing to the "misuse of state resources, instances of coercion and intimidation, partisan behaviour by traditional leaders and overt bias in state media".
Observers say it could be a tight race, but the opposition has said it will protest if their candidate is defeated.
Former Liberian leader Ellen Johnson Sirleaf, the lead observer of a U.S. monitoring mission, said: "The more the presidential vote is delayed, the more it calls into question the population's confidence in the election process". Its population of 13 million is struggling amid shortages of foreign currency, unemployment above 80 percent and lack of foreign investment.
It followed a surprise press conference at which he stunned observers and called for voters to reject ZANU-PF, his former party.
Mnangagwa's government has accused Chamisa and his supporters of inciting violence by declaring he had won.
Mr Mugabe had a bad relationship with Western powers, accusing them of undermining Zimbabwe's sovereignty and trying to topple hm. His youth may appeal to Zimbabwe's young electorate - over 43% of registered voters are under the age of 35.
Footage from inside the aquarium shows two men and a woman sneaking the 2ft-3ft gray horn shark from the building on Saturday. Helen's health. "But it turns out someone actually went inside the aquarium there in Leon Valley and stole a horn shark".
Family law experts say the ruling shows there is a "divorce crisis" and called for the introduction of "no fault" splits. Lord Wilson indicated Ms Owens would be able to divorce in 2020, when the couple have been separated for five years.
Trump came into office previous year promising tax cuts, regulatory reform, and the elimination of foreign tariffs on USA exports. Growth in the first quarter was revised up slightly, from 2% to 2.2%, while the fourth quarter of 2017 dropped from 2.9% to 2.3%.
The final MH370 report found a critical turn was made manually, but it's still unclear who was responsible for that decision . Nathan said "there is nothing new [in the report], but it highlighting failings of some government agencies".
Rudy Giuliani is purposely exchanging "Conspiracy" for "Collusion" to intertwine a legal term of art with a political one. Trump and his lawyers are right that the term "collusion" isn't a precise one when it comes to US law.
A notorious drugs gang in Colombia has placed a £53,000 price on the head of a crime-busting police sniffer dog . But even with advanced technology, experts say on-the-ground detective work such as Sombra's is critical.
Yesterday, a 6.4 magnitude quake struck Lombok and claimed 14 lives, including a Malaysian climber Siti Nur Ismawida Ismail, 30. Lombok, directly east of Bali , is a popular tourist destination noted for its beaches, surfing, and hiking.
The 45-year-old first came into the lobbyist's orbit as an intern in the 1990s, at the firm Black, Manafort, Stone, Kelly. Gates, who worked alongside Manafort as a political consultant, was indicted along with Manafort in October 2017.
Scores of people were chased down and killed by machete-armed mobs intent on hounding out Muslim immigrants in 1983. There will be plenty of scope for filing claims and objections and process for it will begin on August 30.
Giuliani, who called Cohen "an honest, honorable lawyer" as recently as May, has made a sport out of bashing Cohen in recent days.
Meghan Markle's first birthday gift is from PETA
According to James, Thomas' behaviour is "very hurtful to Meghan", which would explain why the Palace has refused to respond. However it seems the frustrated 74-year-old has been left no choice in the wake of Meghan's May wedding to Prince Harry .
Harley-Davidson Bombshell Includes Adventure Bike
Harley-Davidson is also changing its retail strategy and expanding its push internationally following declining USA sales. Growth will be in Asia, and Harley-Davidson intends to pursue it with smaller motorcycles and new business partners.
Donald Trump is facing an 'ultimate nightmare scenario'
Rudy Giuliani, Trump's personal attorney, said Cohen is not credible and that the exchange described by Cohen did not take place. Trump Jr. responded that if the information was good, " I love it ", and the two began to arrange the rendezvous.
White House under fire for barring CNN reporter from event
Yesterday, White House deputy chief of staff for communications, Bill Shine , a former Fox News executive, made a very bad move. Then, National Security Adviser John Bolton said on Wednesday that plans for an autumn visit would be delayed until 2019.
Taliban says group spoke with US official
A former Taliban minister also confirmed that a meeting between US officials and the Taliban took place earlier this week in Doha. Waziri declined to comment, however, on whether the government was aware that the Americans had met with the Taliban in Doha.
For 38 minutes, Tiger Woods comeback looked complete
Our inherent bias and desire for a champion moulded in the cast of our own perceptions is a odd human fixation. That was at Bay Hill, where Woods made birdie on the 13th hole to get within one shot of the lead.
Finally, Priyanka Chopra engaged to Singer Nick Jonas
People Magazine , however, is reporting that Chopra and Jonas got engaged in London on the actor's 36th birthday. And if that didn't sound the alarm, Nick traveled to India with Priyanka in late June to meet her mom.
Weather forecasters predicting a return of the heatwave
Showers in the west are expected to spread through the country and result in cooler conditions of 17-21 degrees on Friday. Now employers have an obligation to provide a "reasonable" temperature in the workplace, but there is no maximum limit.