Police are appealing for witnesses after a man was found seriously injured at Lake Macquarie yesterday.

About 9.25am (Sunday 15 May 2016), a 26-year-old man and a male friend were walking along Green Street, Belmont South.

At the intersection of Marriott Street, the man was found lying on the roadway and bleeding profusely from the back of his head. Emergency services were contacted.

NSW Ambulance Paramedics attended and treated the man. The man was taken to John Hunter Hospital where he remains in a critical condition.

Officers from Lake Macquarie Local Area Command attended are appealing for public assistance in piecing together the circumstances surrounding the incident.

Anyone who may have witnessed the incident or noticed suspicious activity on Green Street, Belmont South between 9am and 10am on Sunday 15 May 2016 should contact Lake Macquarie Police or Crime Stoppers on 1800 333 000.

All information will be treated in strict confidence.

Police are urging anyone with information in relation to this incident to call Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page: https://nsw.crimestoppers.com.au/ Information you provide will be treated in the strictest of confidence. We remind people they should not report crime information via our Facebook and Twitter pages.