These appointments are a result of the decision Friday, the supreme Court of Pakistan to "disqualify" Nawaz Sharif and dismiss the de-facto on the ground that the prime minister does not behave in the " member honest Parliament ".
Reports suggested the PML-N would nominate another MP to serve as interim prime minister for the 45-day period during which the ruling party can prove its majority in Parliament and elect a new leader of the House.
As its new leader Shahbaz Sharif will face the task of steering the ruling PML-N party through political turmoil until next year's election and fending off a rising challenge from opposition leader Imran Khan who emerged as the big victor from the supreme court ruling.
Former information minister Marryium Aurangzeb said that Sharif would make a comeback for the fourth time soon.
The final nomination will be recognised in the party's parliamentary meeting.
"I promise you that this country will become a attractive nation one day...", he said, adding that the way he and his family has been treated is shameful.
Activists of Pakistan Muslim League Nawaz (PNL-N) protest the Supreme Court (SC) decision against Prime Minister Nawaz Sharif, in Lahore, on July 28, 2017.
Nawaz Sharif's resignation on Friday has plunged the nation into political turmoil after several years of relative stability.
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It was chose to appoint Abbasi as interim prime minister to run the government until Shehbaz is elected as a member of parliament, they said.
Although political watchers expect political crisis and tensions between the PML-N and the opposition parties, Nawaz Sharif adopted a soft and reconciliation tone when he spoke to reporters after he presided over a meeting to choose his successor.
As the verdict was announced in Islamabad opposition supporters erupted in applause, rushing into the street chanting slogans and handing out candies in celebration.
The court has recommended anti-corruption cases against several individuals, including Mr Sharif, his daughter Maryam and her husband Safdar, Finance Minister Ishaq Dar and others.
"I still do not understand the grounds for my dismissal", he said. However, he was not allowed to contest the general elections in 2008 due to the murder charges. It toppled Icelandic prime minister from office and the former British prime minister had to face severe scrutiny about tax disclosures.
Meanwhile, the Pakistan Election Commission confirmed that a new vote would be held in Nawaz Sharif's electoral constituency.
However, Shehbaz could not complete his term as he was removed from his post and forcibly exiled to Saudi Arabia following the military coup in 1999.