Officers were called to the Fatling Hornchurch pub in Havering, east London, shortly after midnight on Saturday following reports of the stabbing.
The victim, 23, suffered ‘a number of stab wounds’ and was rushed to hospital following treatment at the scene.
He remains in a serious but stable condition at hospital, police have said. His next of kin have been informed.
Police have today released an image of a man detectives are trying to identify as part of an investigation into the incident.
Footage also shows the man having a conversation in a small group, before he appears to walk behind the victim and inflict a number of blows.
Footage shows the main trailing another pub-goer before inflicting a number of blows in the early hours of Saturday Police today released this image of a man detectives are trying to identify as part of an investigation into the incident The man could be seen walking behind the pub-goer after leaving a conversation with a small group nearby He then appeared to inflict a number of blows to the unsuspecting man, who is in a serious condition in hospital Officers were called to the Fatling Hornchurch pub (pictured) in Havering, east London, shortly after midnight on Saturday
Detective Sergeant Joe Seals, from the Metropolitan Police’s local policing team in Havering, said: ‘We have been carrying out a number of urgent enquiries to track down the person responsible and we are now in a position to release an image of a man we need to identify.
‘I would encourage anyone who recognises this man, or any witnesses who have not yet spoken to police, to contact us immediately.’
A statement from the force added that enquiries into the incident are ongoing and anyone with information is asked to call 101 quoting CAD 36/23Jul.
It said: ‘Detectives investigating a stabbing at a pub in Hornchurch are releasing an image of a man they would like to identify.
‘At 12.06am on Saturday, officers on patrol were made aware of a 23-year-old man who had been stabbed at a pub on the High Street.
‘They called for support from the London Ambulance Service and provided first aid to the man, who had suffered a number of stab wounds.
‘He was taken to an east London hospital where he remains in a serious, but stable condition.’
In a post on Facebook on Saturday, Fatling Hornchurch said: ‘Sadly last night we had an incident here at the Fatling outside the pub, thankfully due to the speedy actions of the staff members and our medically trained door team the incident was dealt promptly and we are pleased to say the victim is well and recovering.’