The deputy town manager in Bougainville's Arawa, Peter Miriki, was admitted to the Arawa Health Centre last Friday with serious knife wounds in his left arm.
Mr Miriki was attacked by a group of men when he was travelling to work in the autonomous Papua New Guinea province.
The men, who were armed with knives and guns, stopped his work vehicle and attacked him.
New Dawn FM quotes Dr Joseph Vilosi, who treated Mr Miriki, saying he was lucky the knife missed a major artery.
The motive for the attack is unknown.