Friends to foes - Guardiola & Mourinho's epic rivalry

BBC Sport unpacks one of football's most dramatic managerial rivalries, which came to a head when Pep Guardiola's Barcelona took on Jose Mourinho's Real Madrid in the 2011 Champions League semi-final.

One-time friends, Guardiola and Mourinho clashed in their pre-match news conferences, and a fierce match followed.

Watch Pep Guardiola: Chasing Perfection on BBC iPlayer and you can delve deeper with an accompanying four-part podcast series on BBC Sounds - 'Sporting Giants'.