Just after 7.05am, police were called to an address on Warialda Street, Kogarah, after reports of a stabbing.
They found a 50-year-old man with a “laceration” to his head.
He was taken to hospital in a stable condition.
Police a short time later arrested a 30-year-old man on Warialda Street, at about 7.40am.
He is assisting police with their inquiries.
Anybody with information is urged to contact Crime Stoppers on 1800 333 000.
