After the victim, who is in his 50s, was attacked on a bus in south London, detectives have released an image of a guy they would like to speak with.
Shortly after three in the morning on June 4, the victim was on a Route 64 bus in Croydon when a man boarded and sat with his feet on the seats.
The victim was stabbed multiple times in the leg after approaching the man, according to the Metropolitan Police.
At the East Croydon rail station, the suspect got off the bus.
The man was hurt and taken to the hospital, where medical attention was given and police were called.