"I'll be taken straight to jail".
"But I'm returning to Pakistan leaving my sick wife behind", he vowed. "Let's build destiny of Pakistan together".
According to news agency AFP, Nawaz Sharif, who has a mass appeal in his country, told cheering supporters: "Put Nawaz Sharif in prison for life, send him to the gallows, but you will have to answer the questions that the people of Pakistan are asking and they will stop only after getting answers".
Former Pakistani Prime Minister Nawaz Sharif will be arrested once he lands at Lahore airport on Friday, Bloomberg quoted Information Minister Syed Ali Zafar as saying on Thursday. Nawaz and Maryam will be flying from Abu Dhabi to Lahore on Etihad Airways flight EY243.
The provincial government in Punjab have mobilised more than 10,000 police officers ahead of their arrival and plan to block roads with shipping containers to shut down Lahore.
On July 6, Nawaz Sharif was sentenced to a total of 11 years in prison and slapped a £8 million fine (Rs1.3 billion) in the Avenfield properties reference while his daughter Maryam was sentenced to eight years with a £2 million fine (Rs335 million).
Their return could shake up an election race marred by claims Pakistan's powerful military was skewing the contest in favour of ex-cricket hero Imran Khan.
Meanwhile in Pakistan, things don't look good for the beleaguered PML-N. The party's past five years in power has been punctuated by the civil-military discord that has plagued Pakistan since its inception.
"Punjab government has not issued any kind of instructions to police for a crackdown against PML-N activists", he said.
In August 2017, Kulsoom Nawaz was diagnosed with lymphoma cancer and has undergone several chemotherapy sessions. NAB Lahore is expected to arrest the Sharifs and hand them over to NAB Rawalpindi, which will put them in jail Friday night and then on Saturday present them before the judge who convicted them.
Nawaz Sharif's daughter Maryam Nawaz also tweeted about Begum Kulsoom Nawaz.
"If he steps out of the house, he will be arrested", said the police.
Recent opinion polls suggest PML-N has lost its lead nationally to the Pakistan Tehreek-e-Insaf (PTI) party of arch-rival Khan, whose anti-corruption message has resonated with many Pakistanis.