Burney, a leading human rights activist, requested the incoming government and prime minister-designate Yousuf Raza Gillani to convert Sarabjit's death sentence into life imprisonment as he had "spent more than a life sentence on death row in Pakistani jails", which was "worse than hell".
He also called for the early release on humanitarian grounds of Sarabjit, who has been held in Pakistani jails for 18 years. Burney said he would not allow the government to hang a person for "reportedly mistaken identity".
Sarabjit was sentenced to death in 1991 for his alleged involvement in four bomb blasts in Lahore and Multan that killed 14 people. His family denies he is a spy as claimed by Pakistan and insists he accidentally strayed into Pakistani territory.
The mercy petition of Sarabjit, who Pakistan claims is Manjit Singh, was rejected by Musharraf on March 3. Sarabjit's mercy petition was sent to the President along with that of Indian prisoner Kashmir Singh, who was pardoned and freed after spending 35 years on death row in Pakistani jails.
Pakistan's Supreme Court too rejected Sarabjit's plea for clemency in March 2006.