Police released a CCTV image of the seven men, after a 41-year-old man was reportedly assaulted while waiting in a taxi queue on Market Hill at around 7.45pm on January 25.
He suffered a cut on his head, a chipped tooth and bruising to his face and body.
Police say the men shown in the image were in the taxi queue at the time of the assault, and believe they may have information that could help with their inquiries.
Anyone with information is asked to call 101 quoting crime reference number 14/23469/20.
You can pass information anonymously to Crimestoppers via their website - www.crimestoppers-uk.org - or by calling 0800 555 111.