Waddell went on to serve Rangers in general manager and vice chairman roles. During Waddell's time as manager, Rangers had suffered the 1971 Ibrox disaster, when 66 fans lost their lives. Waddell was credited with the reconstruction of Ibrox Stadium in the late 1970s and early 1980s, which made it one of the most modern grounds in Europe at the time of his death. He became general manager in 1972, after leaving his role as first-team manager, and latterly took up the role of vice chairman in September 1975. After four years he resigned his position, to be replaced by Lawrence Marlborough, and took up the role of consultant at the club. However, he left this role on 27 June 1981, after Rangers decided not to renew his £15,000-a-year (equivalent to £52,000 in 2015) contract but remained a director of the club until his death.