The beginning of the 2010s saw the genesis of the famous rivalry between Lionel Messi and Cristiano Ronaldo, but on the sidelines of those ElClasicos, another tension-laden battle reached its zenith as Pep Guardiola and Jose Mourinho would embody one of the game's most iconic battles.
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Prior to becoming a manager, the "Special One", as he famously came to be known, was an assistant and translator to the late Sir Bobby Robson at Barcelona. With the pair working together in Catalonia, the Barca captain during that time happened to be a holding midfielder by the name of Josep Guardiola.