Police are appealing for public assistance to help locate missing Keysborough man.
The 77-year-old was last seen at his home address about 5pm on 10 December.
Police and family hold concern for Ronald’s welfare due to a medical condition.
Ronald is Sri Lankan, about 165cm tall, with a fair to olive complexion.
Investigators believe Ronald is travelling in a white Holden Astra, registration XGG197.
Police have released an image of Ronald in the hope someone recognises him and comes forward with information about his whereabouts.
Anyone who sees Ronald is urged to contact Springvale Police Station on (03) 8558 8600.