"His health condition is bad, a team of doctors will examine him in jail today," Samad Khan told AFP from the central prison in the northwestern city of Peshawar, where officials have said Shakeel Afridi is being held.
"He has been kept away from other prisoners to avert any danger to his life," Mr Khan said, without elaborating further on his condition.
On Wednesday, officials announced that the surgeon had been convicted and jailed for 33 years under the archaic tribal justice system that has governed Pakistan's semi-autonomous tribal belt since British colonial rule.
A court operating under the Frontier Crimes Regulations (FCR), which date back to the 19th century, found him guilty of waging war against the state.
Afridi comes from Khyber, one of the seven districts that make up the tribal belt.
A senior official in Khyber, Nasir Khan, defended Afridi's trial.
"We have powers to try a resident of FATA (the federally administered tribal areas) under the FCR enforced in tribal areas," he told AFP.
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