The 73-year-old was last seen at a home in Carramar Street in Mornington on Friday 11 September about 4:30pm.
It’s believed he may be travelling in a grey Toyota Rav4 with registration number 1PZ7TL.
Police are concerned for Alain’s welfare as he left home without his wallet or mobile phone and his disappearance is out of character.
Alain is described as having grey hair and a heavy French accent.
He was last seen wearing a black shirt, navy blue trousers and work boots.
It is believed he may frequent The Briars park in Mount Martha and local beaches on the Mornington Peninsula.
Anyone who sees Alain is urged to contact Mornington Police Station on (03) 5970 4900.