 Koeman's early success, however, was short-lived.In 2005, he resigned after Ajax's defeat to AJ Auxerre in the UEFA Cup during a period of arguments with football director Louis van Gaal.Danny Blind was Koeman's replacement, and the former instantly caused consternation by announcing that the club was to play using a 4–4–2 formation, abandoning the Total Football-oriented 4–3–3 that had become Ajax' trademark.