Legendary Manchester United manager, Sir Alex Ferguson, visited the team's dressing room, following their stunning 3-1 win over Paris Saint-Germain on Wednesday night.
United were trailing 2-0 from the first leg at home, but Romelu Lukaku opened scoring within two minutes for United.
Although PSG levelled through Bernat, Lukaku ensured that the Red Devils went in on top at the break, reacting quickest to Marcus Rashford's rebound.
Rashford then netted a late penalty, thanks to Video Assistant Referee (VAR).
The jubilant players welcomed a famous face into the dressing room at full time.
According to interim boss, Ole Gunnar Solskjaer, "the boss (Sir Alex) is in there (changing room) saying hi to them."
Speaking with beIN sports, Solskjaer described the match as the best moment of his managerial career.
"Best moment of my managerial career? Definitely, absolutely unbelievable. It was great to be there.
"These are the moments, you do it with your staff, the players, the supporters, that's what football is all about. Doing it all together," he said.