Sharif left for Saudi Arabia on a Saudi Airlines flight this evening. On his arrival he is scheduled to meet King Salman and Crown Prince Muhammad bin Salman to discuss what the ruling PML-N said are "important matters".
Sharif, 67, had to step down as chief of the Pakistan Muslim League-Nawaz (PML-N) after he was disqualified as prime minister by the Supreme Court on July 28 in the Panama Papers scandal.
The Sharif family is facing three corruption cases linked to the scandal.
Sharif's family alleges that the cases are politically motivated.
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His younger brother, Punjab Chief Minister Shahbaz Sharif is already in Saudi Arabia on an "official visit". The Saudi government had sent a special plane for Shahbaz's travel to the kingdom last Wednesday. He is believed to have prepared the ground for the visit of his elder brother.
Opposition parties say that since the Sharif family is facing multiple cases in courts and political challenges it needs its friends in the Saudi royal family to reach a deal with the establishment in Pakistan.
"It looks like the matter is towards seeking forgiveness and that an National Reconciliation Order (deal) may be on the horizon. If such a situation arises, I think we will have to shut our courts and go home," he said.
"I feel sorry to see that foreigners are being involved in local matters. If Saudi Arabia intervenes for reconciliation between the Sharifs and the establishment it will be shameful that Pakistan, a nuclear power, cannot make its own decisions," Shah said.
Pakistan Tehreek-i-Insaf chief and cricketer-turned- politician Imran Khan said his party would launch a movement if the Sharifs were given any relief.
Foreign Minister Khawaja Asif rejected the opposition's charges, arguing that the Sharifs had spent eight long years in exile in Saudi Arabia and enjoyed good relations with the royal family.
Saudi Arabia had brokered a deal with former army chief Gen Pervez Musharraf in 2000 to provide safe passage to the Sharif family to live in exile in the kingdom after Musharraf had toppled Sharif's government in 1999.