Greensborough Highway Patrol officers are investigating a hit and run in Northcote last month.
It is understood a vehicle collided with a cyclist on at the intersection of High Street and Darebin Road about 7pm on Wednesday, 31 July.
The cyclist, a 28-year-old man, was taken to hospital with serious leg and head injuries.
The driver of the vehicle, believed to be a light-coloured Toyota sedan, briefly stopped at the scene before fleeing.
The sedan was last seen driving on east along Darebin Road towards Victoria Road.
Investigators have released footage of the vehicle involved in the hope someone may recognise it.
Police are appealing for any witnesses, or anyone with dashcam footage around the time of the incident which may assist with their enquiries.
Anyone who witnessed the incident, has dashcam/CCTV footage or information is urged to contact crime Stoppers on 1800 333 000 or submit a report at www.crimestoppers.com.au