Christopher Johnson was walking along Sheil Road in Kensington after spending the night at his best friend’s house when he was attacked.
The 22-year-old says he cannot remember the incident, but woke up on the floor at around 11am having lost the last hour of his memory.
Merseyside Police have confirmed they received reports of an assault and are currently investigating the matter further.
A spokesperson for the force said they had received third party reports that a man had been injured and were waiting to speak to him before investigating further.
Anyone with any information should call police on 101 or Crimestoppers anonymously on 0800 555 111.