A man launched an attack at a victim in a Liverpool city centre bar.
The suspect punched a man in the face, knocking him to the floor, in Rubber Soul on Mathew Street.
The 34-year-old victim needed hospital treatment for a head injury after the incident, which took place at around 11.15pm on Saturday, December 18.
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Detectives have now issued CCTV images of a man they would like to trace.
They believe the man pictured will have information about the assault that took place that could help with their enquiries.
Detective Inspector Chris Saidi said: "This was a dangerous and reckless attack that has left the victim seriously injured, and such violence like this will never be tolerated on the streets of Merseyside.
"This incident took place at a time where it would have been busy time, so if you were in the vicinity at around 11.15pm on Saturday 18 December and saw anything, then please contact us.
"I am also appealing for people to come forward if you recognise the male featured in these images. We believe he could hold information that could be vital to our continuing enquiries."
Anyone with information on this incident is asked to contact @MerPolCC on Twitter or ‘Merseyside Police Contact Centre’ on Facebook with reference 21000874644.
You can also pass information via the independent charity Crimestoppers anonymously, on 0800 555 111 or via their online form at: https://crimestoppers-uk.org
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