Police have appealed for assistance to find Attila Bogar, a 35-year-old man from the Melbourne suburb of Avondale Heights, who was last seen on October 9.

Police believe Mr Bogar may have been in Wollongong on October 10.

A multi-agency search for the man was sparked on Friday October 17 by the discovery of his car - a grey Audi Q3 - on Picton Road at Cataract.

Members of the police rescue squad, and the State Emergency Service, scoured the area over the weekend and all this week, but have not located Mr Bogar.

Carly Heard, a friend of Mr Bogar, contacted the Mercury on behalf of his family to plead for any information on his disappearance.

‘‘His friends and family are concerned for safety. We appeal for anyone who knows something, or for Attila, to contact police,’’ Ms Heard said.

‘‘He is a very family-oriented man, with lots of friends.’’

Ms Heard said Mr Bogar may have been in NSW searching for an old family friend who lived in Sydney.

Police have also appealed to the public for information.

‘‘We are concerned for his welfare, and an investigation is underway into his disappearance,’’ Wollongong police crime manager, Inspector Tim Beattie, said.

Mr Bogar is described as 180cm tall with a  medium build, dark brown short hair, and an unshaven face. He is believed to have been wearing jeans and a t-shirt at the time of his disappearance.

Anyone with information about his whereabouts is urged to contact Triple 0 or Crime Stoppers on 1800 333 000.