A Mill Park man, 40, was attacked by two men in Elwood overnight.
The man was attacked from behind as he approached his car about 10.40pm at the foreshore car park at Point Ormond.
He was robbed at knife point before being stabbed with what is believed to be a syringe by one of the men before they fled.
Anyone with information is urged to contact Crime Stoppers on 1800 333 000.