The Premier League leaders had a comfortable 2-0 advantage from the first leg, and Javier Hernandez put them in an even more commanding position with an early goal at Old Trafford.
However, strikes from Aras Ozbiliz and Toby Alderweireld gave the home faithful a nervy last couple of minutes, but the English team held on to secure a place in the next round.
Returning defender Phil Jones admitted that his side were not good enough, and will need to improve for the rest of the season.
“I don’t think we were at our best tonight,” Jones told Sky Sports.
“We got off to a great start, scored and seemed to be in control of the game.
“But a little bit of complacency set in. We should have won the game and we will review our performance tomorrow and take it from there.
“The manager said at half-time we’ve got to up the tempo and we didn’t do that for whatever reasons. We weren’t good enough in the second half, nowhere near.
“We’ve lost the game tonight and we’re bitterly disappointed,” he stated.
The Red Devils take on Athletic Bilbao in the next round of the tournament, and have a Premier League fixture against Norwich to worry about this Sunday.
By Gareth McKnight
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