Police are appealing for public assistance following an incident in Hallam earlier this month.
Investigators have been told a white Daihatsu Delta truck rammed a Blue Mitsubishi Pajero on Belgrave-Hallam Road about 2.25pm on 10 April.
Both drivers got out of their cars and were involved in a physical altercation near the Monash off-ramp.
The driver of the Daihatsu was stabbed during the incident and taken to hospital.
Officers are keen to speak with the driver of the Pajero and have released a facial composite of this man along with the clothing he was wearing.
Anyone who may have witnessed the incident or with any information or dash cam footage is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report online at www.crimestoppersvic.com.au