Frankston Crime Investigation Unit detectives are appealing for information after a man was found with serious injuries in Frankston last night.
Emergency services were called to reports of a man in his 40s with head injuries on Cecil Street, near Victoria Parade, about 7.10pm.
He was taken to hospital and remains in a critical condition.
Police are working to establish the circumstances of the incident and where it occurred.
At this stage, detectives do not believe the man was struck by a vehicle.
Anyone who witnessed the incident, with CCTV/dashcam footage or any information that could assist police is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au