Emergency services were called to Rowlands Road on Saturday (Credit: Google Maps)
A number of people were involved in a fight in Rowlands Road shortly before midnight on Saturday, 22 May.
The victim suffered a head injury during the incident and was taken to hospital for treatment. He remains there in a critical condition.
Police have not yet identified the man and are still investigating the incident.
No arrests have been made.
Anyone with information that could assist police is asked to call 101 or tweet @MetCC and quote CAD 7885/22May.
Alternatively, you can speak to the independent charity Crimestoppers anonymously on 0800 555 111.
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Tags: Dagenham, Barking and Dagenham, Assault