Police are appealing for public assistance to help locate missing man Robert.
The 77-year-old was last seen on Railway Parade in Deer Park about 12 Noion on Wednesday (June 28).
He is described as 170cm tall with stubble, a bald head and has tattoos on both arms.
Robert is known to frequent the Werribee, Hoppers Crossing and Maidstone areas.
Police and family have concerns for his welfare due to medical conditions.
Anyone with information is urged to contact Sunshine Police Station on 9313 3444.