It’s believed the 18-year-old got out of his vehicle to meet a coworker on Wiltshire Lane before an unknown man suddenly approached in a white car about 5.20am.

An altercation followed and the unknown offender assaulted the victim before stealing his car keys and speeding off in the white car.

Police were told the parties were not known to each other before this morning’s mugging.

The victim’s car was not stolen in the incident.

Officers doorknocked nearby houses to see if there were any witnesses and have appealed to the public for information.

No arrests have been made.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report to www.crimestoppersvic.com.au