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#3 Barcelona v Manchester United
Last few times the Catalan giants and the English giants have met in a competitive fixture, it has always been a final of the competition.
While Manchester United just edged past Valencia to secure the second spot in Group H, Barcelona dominated Group B, staying unbeaten so far in this year's Champions League.
Manchester United manager Jose Mourinho knows Barcelona in and out, having been at the club as an interpreter and then assistant manager before returning to the club as an opposition manager during his time at Real Madrid.
While Manchester United are facing their own crisis in the Premier League this season, Barcelona, even if being top of the La Liga, are not having the best of their seasons if compared to their previous years' performances.
It would be a head to head midfield battle if the clubs clash in the Round of 16, with Manchester United's Paul Pogba, Juan Mata and Fred battling their way through Barca's dominant trio of Arthur Melo, Philippe Coutinho and Lionel Messi. Not to miss both the clubs' strikers, Luis Suarez and Romelu Lukaku, who can be lethal in front of the goal on occasions.
