A 25-year-old Sunshine West man was robbed, bitten and punched in a incident last month.

Police said the man was driving a silver Honda Jazz along Maribyrnong Road in Maribyrnong about 3.30pm on December 30 when he was rear-ended by a blue Audi hatch.

The driver of the Audi approached the man and after a conversation, allegedly assaulted the Sunshine West man.

The victim was punched, bitten and thrown against nearby vehicles before his phone was stolen.

The Audi driver is described as bald, with a sleeve tattoo on his left arm and tattoos on his lower back.

He was wearing a gold chain, Rabbitohs NRL black shorts and a blue Deus T-shirt at the time.

Anyone with information is urged to contact Crime Stoppers on 1800 333 000.