A 63-year-old man was attacked and left unconscious in March at the weekend.
Police were called to Nene Parade at about 2.30pm on Saturday November 11.
Cambridgeshire Constabulary have since identified a man they wanted to speak to in connection with the assault.
Officers are also keen to speak to a woman who was riding a bicycle in the area at the time of the assault.
Anyone with information should report it through the force website using reference 35/84297/23.
Anyone without internet access should call 101.
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