Merseyside Police have arrested two women on suspicion of an assault that left a Woolton man with a fractured skull and bleeding on the brain.
The 34-year-old man was found by a member of the public lying on the street at Lower Farm Road, Belle Vale, east Merseyside, at 10.48pm on Sunday, 4 January.
He had sustained a wound to the back of his head and a split lip and is now receiving treatment for a fractured skull and bleeding on the brain in the Walton Centre, a head injury specialist.
His injuries are not thought to be life-threatening.
Two women, a 29-year-old from Woolton and a 24-year-old from Childwall, were arrested on suspicion of assault and later released on bail pending further enquiries.
Detective Inspector Sarah Kenwright, said: "We are working hard to establish exactly how the victim came by his injuries. We believe an altercation took place shortly before the incident and would ask anyone who may have heard or seen anything on the evening in that area to contact us.
"We are particularly keen to speak to a man walking his dog nearby who may have witnessed the incident."
Anyone who has information is asked to contact Merseyside Police on 0151 777 4830 or Crimestoppers on 0800 555 111.