Michael Fewtrell was last seen in the Beechings Way area at around 7pm on 31 July 2021 and reported missing to Kent Police a week later.
It has been reported that he may have travelled to Portsmouth in a blue Ford Focus and could still in the Hampshire area.
The 36-year-old is described as being around 6ft tall with short brown hair and a large build.
He was last seen wearing a grey tracksuit with white trousers and may be travelling in a blue Ford Focus.
Anyone with information is asked to call Kent Police on 101 quoting 07-0565.