Moorhouse said the victim was hit over the head with a bottle and punched and kicked several times.
“Police are appalled at the level of violence that has been inflicted on this man in his home.”
The man was later taken to Gisborne Hospital, where he was being treated for serious head injuries and broken ribs, Moorhouse said.
“He is in a stable condition.
“The man’s wife was uninjured in the attack, but understandably it has left her severely traumatised.”
Moorhouse said police believed there was a young woman present with the four men.
After the assault, they all left the scene in a vehicle.
“Police would like to hear from anyone with information that may assist our enquiries,” Moorhouse said.
Anyone with information can contact police on 105 or anonymously via Crime Stoppers at 0800 555 111.