"He was knocked unconscious by the offenders who also stole cash from his wallet."
The victim was able to eventually make his way home where he sent a text for an ambulance and was taken to hospital.
Police said they now wanted to locate the males responsible for the "serious incident".
"The two males are described as teenagers of Māori ethnicity, one of whom was taller and slimmer in build than the other.
"One of the males also has a distinctive ginger stripe down the middle of his hair."
Police say they want to hear from any witnesses or anyone who may recognise the description of these males.
* Anyone with information is asked to contact police on 105, quoting file 210426/9966 or Crimestoppers anonymously on 0800 555 111.