Ever since Guardiola was named as the Barcelona manager in 2008, he and Mourinho have become locked in one of the fiercest managerial rivalries in history.
As Guardiola arrived at City via Barcelona and Bayern Munich, Mourinho has undertaken spells with Chelsea (twice), Inter Milan, Real Madrid and now United.
They’ve already faced each other once this season, with Guardiola triumphing 2-1, and Mourinho needs a win in midweek for many reasons.