Reds season-ticket holder Dave Martin was in an ideal position to observe both the game and the reaction to it – he lives in Sitges, just over 20 miles from Barcelona's home ground.
This was a United away game in his adopted homeland, and he was more than happy with the way Erik ten Hag's men performed.
So how does Catalonia feel ahead of the tie's conclusion at Old Trafford on Thursday? Dave filled us in on the mood amongst Barcelona supporters...
What did you think of the first leg? Did you go to Camp Nou, and were you in with the Barca fans or United?