Police arrested a 28-year-old man following an alleged serious hit-run collision in Bayswater in the early hours of the morning on Monday 24 July.
It is alleged a 22-year-old man was sitting in the middle of Boronia Road, near Lewis Road, when he was struck by a car at about 3.10am.
The Narre Warren man was taken to hospital where he remains with critical injuries.
It is alleged the driver involved did not stop at the scene and fled in the damaged vehicle.
Police received reports of a damaged vehicle with a man sleeping inside parked on Jacobus Walk in Ferntree Gully shortly after 8am.
The Bayswater man was arrested and is assisting investigators with their enquiries.
Detectives would like to speak to anyone who saw a blue XR6 sedan travelling in the area prior to the collision.
Anyone who witnessed the incident, has dashcam/CCTV footage or information is urged to contact Crime Stoppers on 1800 333 000 or make a report online at www.crimestoppersvic.com.au.