The 39-year-old was attacked after a man and woman entered his property in Sultan Road, Buckland, shortly after 2pm on Monday.
He was left with bruising to his face and had a number of mobile phones stolen from him during the raid, police have said.
Now detectives investigating the crime have released an image of a woman they believe was involved in the aggravated burglary, which a senior officer has since described as ‘unusual’.
She is described as white, aged in her late 20s, 5ft tall and of medium build. She had long, dark hair, and was was wearing a black skirt, red top, a cream coloured scarf, and large brown sunglasses.
Acting Detective Inspector Richard Gibson said: ‘This is an unusual incident, and we have not received any similar reports in the area. I’m hoping that someone will recognise the woman pictured, or saw her in the area at the time, to help us to progress our enquiries.’
Anyone with information can call 101, quoting the reference 44200314680.
Alternatively, witnesses can call Crimestoppers anonymously on 0800 555 111.
You can catch up with more of our stories about crime and incidents in Portsmouth by joining our Portsmouth Breaking News and Incidents Facebook group.