The incident happened in Sin Bar in New Street in Worcester on Saturday, December 21.
The assault happened just after midnight within the Sin Bar on New Street when a fight broke out and two men where were left unconscious.
RECOMMENDED READING: Woman sexually assaulted in Worcester as police issue appeal
RECOMMENDED READING: M5 junction 6 Worcester: eight ‘drug dealing’ arrests
One victim received cuts to the face and neck and while unconscious the other victim was kicked to the head.
Two men, 18 and 20, were arrested on suspicion of grievous bodily harm. They remain on bail.
Officers are keen to speak to the man pictured as it is thought he was in the area at the time and may be able to help with enquiries.
If you know who this man is or have information that would help identify him, please contact Detective Constable Callum Godwin by emailing callum.godwin@westmercia.police.uk or by texting 07816343902 quoting 22/110709/24.
Alternatively, if you have information but don’t feel comfortable speaking to police, you can speak to the independent charity Crimestoppers. It is 100% anonymous, they never ask your name, and they cannot trace your call or IP address. You can contact them online or by calling 0800 555 111.