The 53-year-old was last seen at 10am this morning (Thursday, 13 July) in the Rowner area.
He is described as: white with a pale complexion, 5ft 6ins and of slim build. He has short dark hair, a moustache and a goatee beard.
Damian has links to the Sussex area.
Police are growing increasingly concerned for his welfare.
Anyone who thinks they’ve seen Damian since he went missing, or has any information about where he might be, should call police immediately on 101 quoting incident number 44230282057. In an emergency dial 999.