As a referee, Ad-Diab presided over the final of the 1968 African Cup of Nations and also refereed during the 1972 Gulf Cup of Nations and the 1976 Summer Olympics. By career he was a water manager and a journalist. In 2007, he was included in an initial list by the Confederation of African Football of the top 200 African footballers of all time. In September 2016 it was reported that he was suffering from Alzheimer's disease and in critical condition in an Alexandria hospital. He died on 30 December 2016 at the age of 89.