Former United captain Bryan Robson knows first-hand what a difference a rocking Old Trafford can make on big European nights.
One of Captain Marvel's finest hours came against Barcelona in a 1984 European Cup Winners' Cup quarter-final. With United 2-0 down from the first leg, Robson scored twice in a legendary 3-0 win soundtracked by a baying home contingent.
“For me, that’s the best atmosphere I’ve ever played in,” he told tonight's edition of United Review. “You could more or less feel the pitch shaking that night, the atmosphere was that good. Everybody had written us off after losing 2-0 in the first leg, and the fans that night were unbelievable.
"Hopefully the boys who play against Barcelona tonight witness an atmosphere like that, because it was an incredible game and it always sticks in the memory. What a night.”
With Tuesday night's Champions League semi-final decider tantalisingly poised at 0-0 going into the second leg, Robson feels United's support can tip the balance in the Reds' favour and help seal a spot in next month's final.
"You can never take anything for granted in this game," he said "The better the support behind you in the return leg, the more the players will rise to the challenge – no doubt.
"I’m sure the fans will do that, because European nights at Old Trafford are special and they know they can help the team."