Police are asking people who may have seen a man getting 'king hit' at Mooseheads in the early hours of December 8 to come forward.

The 23-year-old man suffered serious facial injuries during the alleged assault.

He reported the incident at City Police Station at about 3am that morning, saying he was 'king hit' by a man he did not know.

Anyone who may be able to help police is asked to contact Crime Stoppers on 1800 333 000, or via website at act.crimestoppers.com.au.