Police said that the attack on the 36-year-old took place around 02:15 on Bond Street.
He was reportedly punched “several times”. Despite sustaining “several facial injuries”, the victim did not require A&E attention.
The alleged perpetrator was described as being “about 5’8 tall, of stock, muscular build, with short, cropped, fair hair and wearing a padded, dark coloured body warmer with a white T-shirt and jeans”.
Pictured: The assault happened in Bond Street, St. Helier.
Police are now appealing for information from witnesses of the attack or anyone who knows more about what happened.
Those with information are being urged to call 612612 or make an anonymous report using the Crimestoppers online form.