The aggravated burglary took place in a flat in Radnor Road, Durrington, at 2pm, on July 26.
Two men entered the flat and hit the victim, a 35-year-old man, with a lamp and smashed a couple of windows.
DC Mandy Taylor said: “We are keen to talk to anyone who saw two white men in their 20s in the area or who might have heard a disturbance at the flat during the afternoon. If you saw or heard anything then please contact us on 101 and quote serial 1876 of 26/7 or anonymously contact crime stoppers on 0800 555 111.”