Sotirios Libates, 84, has been missing since the afternoon of Wednesday, September 9, in the Drymos area of Thessaloniki.
His car, a blue Ford escort, was found a day later about 15km from the village of Drymos where he lives.
It was found open with the keys on the starter and inside there was his driving licence, his identity card and a toll receipt.
The employee at the Analipseos – Lagada tolls said that the elderly man seemed disoriented.
He has a height of 1.70, white short hair and brown eyes.
For his disappearance Silver Alert has been activated.