It had looked like United would make comfortable progress after goals from Manuel Ugarte and Diogo Dalot in a commanding first-half display had them in control.

But they proceeded to throw away the two-goal advantage as Corentin Tolisso and Nicolas Tagliafico struck to level the tie and take the game to extra time.

Even though Lyon had Tolisso sent off in the final minute of normal time, Rayan Cherki put the French side ahead before Alexandre Lacazette’s penalty looked to have sent them through, prompting some United fans to leave and beat the traffic.

But then came the incredible fightback as Bruno Fernandes’ penalty and Kobbie Mainoo’s cool finish levelled matters, before Old Trafford erupted when Harry Maguire headed in the winner with seconds remaining.

“The sounds of the stadium was the best ever,” Amorim added.

“Some people collect shirts, scarves, but I want to keep that sound, it’s the best sound in the world.

“I feel for the people who had to leave at 4-2 because of the traffic, they will be gutted.

“We know we are underperforming and deserve all the critics, but we have time to make something special of this season.”

Maguire agreed with his manager that the Old Trafford atmosphere was something that helped the players stage one of the most memorable comebacks.

“To go down 4-2 in extra time to 10 men is not good enough, we opened ourselves too much,” he said.

“But we dug in and showed great spirit, that’s what this stadium does.”