Man pinned under car in Melbourne

A man has suffered serious injuries after he was pinned under a car for up to four minutes after it rolled on him on a hill in a muddy area in Melbourne's west.

The man in his 30s suffered head and chest injuries and a burn to his leg in the incident at Clarkes Road at Brookfield just before 9.30am on Sunday, an Ambulance Victoria spokesman said.

The man is in a serious condition in Royal Melbourne Hospital.