Sharif is now holding rallies across Punjab, where the city of Lahore - the Sharif family's home town - is the provincial capital.
An investigation had been launched, he said.
It was still unsure if the caravan will reach its destination on Friday night as Sharif is set to address a few public rallies, including in Gujrat and Gujranwala. "Nawaz Sharif has made a smart move".
The Punjab Chief Minister Shahbaz Sharif has said that the former Prime Minister Nawaz Sharif and the people are inseparable, and their relationship of love can not be dented by the negative politics of the opponents.
Sharif hopes to bring tens of thousands more into the streets in Lahore but it is not yet known when he will arrive in the Punjabi capital.
Sharif is travelling in a bomb-proof vehicle especially designed for the journey, meant as a show of strength after the Supreme Courts decision left his ruling party scrambling to replace him.
The convoy is surrounded by heavy security, with fears lingering after a truck bomb exploded in Lahore on Monday, killing one person and injuring dozens.
Umair Mazhar, 26, insisted no allegations of corruption had been proven against the former leader.
"Pointing out that gathering here serves as a referendum, he claimed that the court of the people of Pakistan has given its verdict in his favour".
Kulsoom Nawaz submitted her nomination papers to the Election Commission of Pakistan (ECP) on Friday.
This appears to be a change of plan for the family, who indicated originally that Mr Sharif's younger brother would run for the seat, and then the premiership.
Afzal Butt said the PML-N were directly responsible for the deplorable incident.
Kulsoom Nawaz will contest the seat her husband was forced to vacate last month after becoming embroiled in the Panama papers scandal.