Bandits wearing balaclavas broke into a Keysborough home and assaulted a man.
Police said the incident happened in Henderson Road shortly after midnight on Friday 21 July.
They said the attackers broke a window to enter the home and struck the victim, 49, causing arm and facial injuries.
Two other adults were home at the time, but were not injured. Nothing was stolen.
Police urged anyone with information to call Crime Stoppers on 1800 333 000.