Officers are appealing for witnesses to come forward following an incident in Crewe.
At around 12.06pm on Friday 29 July, a man was brought into Hungerford Medical Centre with a serious head injury.
The man was subsequently taken to Leighton hospital for further checks and is now recovering.
The 29-year-old man has no recollection as to how these injuries were sustained and police are now appealing for information from the public.
DC Kate Palin said: “This was a frightening incident that left the man extremely shaken up and requiring hospital treatment.
“Thankfully, he is now recovering from his injuries, and I would like to reassure the community that we are committed to doing all that we can to establish exactly what has taken place.
“Enquiries are ongoing, and I urge anyone who was in the area and witnessed what happened, or anything else that may be relevant to our investigation, to come forward.
“If you think that you witnessed, or have CCTV or dashcam footage of, anything that may be relevant to the investigation please get in touch.”
Anyone with information or CCTV footage that may help detectives with their ongoing investigation should call Cheshire Police on 101, quoting IML 1328934, give the details through our website, or contact Crimestoppers anonymously on 0800 555 111.