Police state the migrant worker attacked with an axe in a house in Maafannu district on Monday night had sustained the injury attempting to stop a robber.
The incident was reported to police at approximately 11:55 pm on Monday.
The migrant injured in the attack is being treated at the Indhira Gandhi Memorial Hospital (IGMH).
Police have yet to make an arrest in the case.
The police had initially reported that the injured migrant was the suspected robber, but later said preliminary findings showed he had not been the robber, but had attempted to stop the robber.