Imran Khan's chances of survival are getting slimmer and the easiest way to end the uncertainty is to get back the support of all allies and win back dissidents within his own party.
Nawaz and Maryam are expected to land at Lahore's Allama Iqbal International Airport at 6.15 p.m. (local time) from Abu Dhabi.
The Pakistan Muslim League-Nawaz is making all efforts to give a rousing welcome to Nawaz and his daughter Maryam Nawaz on their arrival in Lahore on Friday.
NAB officials said the case was related to alleged loss of over Rs 120 million to the national exchequer over the construction of a two-way road in 2000 from Raiwind to the Sharif family home.
At least 10 people were killed and 27 others injured in separate smog-related accidents in Pakistan's East Punjab province over the last two days.
He said the Sharif brothers planned to kill him when he was going to a court to attend his hearing.