An 18-year-old man was hit in the back of the head with an unknown object during an assault in Rugby during the early hours of Saturday February 18.
The assault happened outside Rugby Lions Rugby Club on Webb Ellis Road at around 12.15am.
The victim suffered cuts to his head and was treated at the scene by ambulance staff.
Enquiries are currently ongoing but officers are keen for anyone who saw the assault, who witnessed anyone acting suspiciously or who was in the area at the time of the incident to come forward.
A fundraising event is believed to have taken place at the premises that evening and officers are also keen to speak with anyone who attended to see if they can help with the investigation.
Anyone with any information is asked to call Warwickshire Police on 101 or Crimestoppers anonymously on 0800 555 111 quoting incident number 7 of February 18.