 On 5 November 1977, the down-to-earth defender scored four goals in MSV Duisburg's 6–3 against Bayern Munich and was, in 1978–79, the captain of MSV Duisburg when they reached the round of the last four in the UEFA Cup.To honour the efforts of Dietz for MSV Duisburg in his career, the fans of the club decided to dub the club's mascot, a zebra, "Ennatz".