Detectives are asking for the public to help them piece together what happened to a man who was found unconscious on a street in Hyson Green.
Officers say he was discovered lying on Noel Street at about 5.40pm on Thursday, March 10.
The 31-year-old was taken to the Queen’s Medical Centre, where doctors discovered he had suffered a serious head injury.
He remains in a serious condition in hospital and officers say it is still not clear how he came to be so badly hurt.
A Notts Police spokesman said: “Detectives investigating the circumstances are keen to hear from anyone who saw or heard anything suspicious.”
Anyone with information is asked to contact Notts Police on 101, or Crimestoppers, which is free and anonymous, on 0800 111555.