Despite establishing himself as one of the most successful coaches of his era and in the history of Real Madrid, Zidane's time at Real Madrid was considered by some to be shadowed by a partial amount of luck. However, Zidane's tactical philosophy, particularly his tactical flexibility, has been praised by many. Zidane's tactical style, characterized by its formation flexibility and attacking football, as well as his ability to unite the dressing room, have been positively compared to Carlo Ancelotti's coaching method. His use of in-game substitutions was particularly praised, as many of his substitutes led to victories, such as introducing Marco Asensio and Lucas Vázquez in order to provide pace and width against Paris Saint-Germain in the UEFA Champions League to overturn a 1–0 deficit into a 3–1 victory. His introduction of Gareth Bale for similar reasons in the 2018 UEFA Champions League Final also reaped similar rewards. It is also noted that his team focused on attacking through the flanks, while he is credited for repopularising the 4–4–2 diamond formation in contemporary football.