United followed up the 3-0 victory at San Mames by falling behind in the first half at Old Trafford to Mikel Jauregizar's superb strike but came on strongly in the closing stages at Old Trafford.
Mason Mount levelled and, after further goals by Casemiro and Rasmus Hojlund, our no.7 set the seal on a fine win to set up a final date with Tottenham Hotspur on 21 May with a brilliant long-range effort.
See what Ruben Amorim had to say to the official broadcasters after the final whistle...
FOR THE FANS
“It's the least we can do for these fans, for all the support that they gave us in this tough season.