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Police are hoping to identify a possible witness after a man in his 70s was knocked over by an unknown person on a bicycle in Blatchington Road.
It happened at around 9.45am on 23 May, outside the Post Office at the junction of George Street.
The victim suffered leg and facial injuries.
Enquiries have been ongoing since that time, including a review of CCTV footage in the area.
As a result, officers have identified a man (pictured) who they believe was on scene moments after the assault and who may have seen the suspect.
They would like to speak to him to see if he has any information that could assist the ongoing investigation and ask him or anyone who recognises him to get in touch.
The suspect is described as aged 20-25, around 6’ and of slim build, and was riding a red bicycle.
Anyone who witnessed the assault or who has any other information is asked to contact police online or by calling 101 quoting serial 686 of 31/05.