The party has also arranged a bulletproof vehicle to transport senior leaders to the Lahore airport.
From Lahore, they are expected to be taken to Islamabad by helicopter and moved to Adiala jail. Deputy Inspector General Operations Shahzad Akbar said 10,000 police officers will be deployed across Lahore on Friday to "maintain law and order". But I'm doing this for people of Pakistan, sacrificing for generations to come.
Earlier, Pakistan Tehreek-e-Insaaf (PTI) chairman Imran Khan had criticised the PML-N's move to welcome Sharif and his daughter. "The country is at a critical juncture right now", said Nawaz Sharif.
Sharif's return from London, where his wife Kulsoom is critically ill and undergoing cancer treatment, comes at a time of dwindling fortunes for his party, which a year ago was considered a run-away favourite to retain power.
National Accountability Bureau chairperson Javed Iqbal has formed a 16-member team to arrest the two and shift them to Adiala Jail, Rawalpindi after producing them at the accountability court. In a video message reportedly from aboard his aircraft en route to Pakistan, Sharif said he was returning knowing he would be taken directly to prison.
Sharif returned from Britain after an anti-corruption court handed him a 10-year jail term and sentenced his daughter and political heir to seven years in prison for failing to prove that money used to buy luxury flats in London in the 1990s was not ill-gotten.
Security has been tightened and all roads leading to Punjab's capital city have been blocked to prevent PML (N) supporters to reach there.
The younger Sharif has called upon Mr. Askari for the immediate release of the detained workers.
His return is seen as a public show of acquiescence meant to win sympathy from voters in an election that analysts predict could either spell the downfall of one of Pakistan's most charismatic leaders, or lead to years of civil unrest and political instability.
"We will not accept the results of the July 25 polls if pre-poll rigging is not stopped", said Nawaz Sharif's brother Shahbaz Sharif.