Although the PTI has emerged as the single largest party in the National Assembly after the polls, the final results issued by the Election Commission of Pakistan show that the party is still short of numbers to form its government independently.
In a related development, two main parties - PML-N and PPP - have agreed on formulation of a "coordinated joint strategy".
PML-N head and former Chief Minister Punjab Shehbaz Sharif has stepped up efforts to woo political parties.
He again made it to the National Assembly in 2013 and led his party from the front in the Lower House of Parliament because Khan was rarely seen in House during the last five years.
PTI has emerged the victor of parliamentary elections with 116 seats, with the previous ruling party Pakistan Muslim League (Nawaz) obtaining just 64 seats.
Activists from the Jamiat Ulema-e Islam party protest against alleged election rigging in Peshawar, Pakistan, on July 27, 2018.
Khan has said that he will take oath as the Pakistan prime minister on August 11, Radio Pakistan reported on Monday.
Attended by leaders of various parties, the MPC was chaired by PML-N President Shahbaz Sharif and Muttahida Majlis-i-Amal (MMA) President Maulana Fazlur Rehman.
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A recent Afrobarometer survey of 2,400 people put Mnangagwa on 40 percent and Chamisa on 37 percent, with 20 percent undecided. President Mnangagwa urged voters to be peaceful on Monday. "We are very happy to have a different vote", he said.
Adding an uncertain political element, Sharif's PML-N party won 127 of 297 seats in the regional parliament in Punjab, the country's largest province with 60 per cent of Pakistan's 200 million people.
Analysts have expressed concern that disgruntled losers could create instability for the incoming new government, which will face mounting challenges - including a crumbling economy, a crippling debt and a raging militancy.
He said that they had called the people who won the election to celebrate.
She said the United States, along with its global partners, will continue to encourage a broadening of opportunities for political participation for all Pakistanis and for the further strengthening of legitimate, democratic institutions. "In all this hue and cry, we didn't notice there is another Pakistan there that wanted this change", she told AFP.
Khan claimed victory in a wide-ranging address to the nation Thursday.
Earlier, the cricketer-turned-politician had said his government would seek good relations with India and would like leaders of the two countries to sit across the table and resolve all disputes.
After an exceptionally slow count, Pakistan election officials on Friday announced the cricket star's Pakistan Tehreek-e-Insaf (PTI) party won 109 of the 269 seats being contested in the National Assembly.
Known in Pakistan as "Taliban Khan" for his calls to hold talks with insurgents, he increasingly catered to religious hardliners during the campaign, spurring fears his leadership could embolden extremists.