Sydney man missing for four days

A 64-year-old Sydney man has been missing for four days and police are calling for public assistance to help find him.

Paul Parkinson was last seen at this home on Vaughan Street in Blakehurst on Monday and police say he may have been in a minor crash that afternoon.

He is described as Caucasian, about 170cm-177cm tall with a heavy build, receding grey hair, a fair complexion, brown eyes and wears glasses.

It's not known what he was wearing when he left his home.

His family is concerned for his welfare as he needs regular medication and his behaviour is considered out of character.

He may appear confused or disorientated.