Police report a man allegedly clubbed family member who suffered head injuries and been flown to a Melbourne hospital

​​A HAMILTON man in his 20s is under police guard in hospital after allegedly clubbing a family member over the head.

Police said the victim in his 50s was flown by air ambulance ​to a Melbourne hospital with serious but not life-threatening head injuries.

​It's understood a family violence incident unfolded at 9.30pm on Monday night.

The man in his 20s was arrested but had also suffered injuries and remains under a police guard at the Hamilton Base Hospital.

Police will be speaking to him on Tuesday morning  and it's expected he will appear in court during the day for a bail/remand hearing.

The victims are known to each other and the cause of the incident is not known by police at this stage.