The incident took place in the west end of Montague Street at just before 7.30pm on Saturday, April 23.
The victim was a 23-year-old man who was wearing a white jumper and blue jeans and was accompanied by two older men in their fifties at the time.
He was stabbed in the leg, requiring treatment at Worthing Hospital.
Police believe the injury was caused during an altercation with a group of teenage boys which occurred close to the Chicken Cottage and Lemon Grass restaurants.
A 17-year-old from Worthing has since been arrested on suspicion of wounding with intent and possession of a bladed article. After being questioned he was released on bail until June.
Anyone who witnessed the incident is asked to email [email protected] or phone 101 quoting serial 1260 of 23/04.
Alternatively, they can contact the independent charity Crimestoppers anonymously on 0800 555 111 or by visiting crimestoppers-uk.org.
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