Police in Croydon continue to appeal for help to trace vulnerable missing man George Aird from New Addington.
George, 26, was last seen at about 01:30hrs on 27 December 2017 in the Canary Wharf area.
Having been to visit his mother for Christmas in the Eastbourne area of East Sussex, he was dropped off at his home address in New Addington by a family member.
Investigating officer Detective Inspector Paul Callister said: "We are becoming more concerned for George's welfare with every passing day.
"George suffers with Aspergers and may have difficulty communicating that he needs help.
"His family is desperate for news that he is safe. Please contact us without delay if you have seen him or know where he is."
George is a black male, around 6ft tall and of stocky build with afro hair. At the time of his disappearance he was wearing a smart grey coat, white shirt, blue jeans, black trainers, a stripy scarf and a dark coloured rucksack.
He may appear confused.
Anyone with information on George's whereabouts should call Croydon's Missing Persons Unit on 020 8649 0016, 101, or Missing People on 116000.