Ahead of his impending retirement at the end of a 26-and-a-half year stint in charge of the Reds, the boss addressed the capacity crowd to reflect on his incredible tenure.
Click on the video above to watch Sir Alex's emotional farewell. You can read a full transcript below.
Sir Alex: "I've got absolutely no script in my mind, I'm just going to ramble on and hope I get to the core of what this football club's meant to be.
"First of all, it's a thank you to Manchester United. Not just the directors, not just the medical staff, not just the coaching staff, the players or the supporters, it's all of you. You have been the most fantastic experience of my life.
"I have been very fortunate to manage some of the greatest players in the country, let alone Manchester United. All these players here today have represented your club the proper way - they've won the championship in a fantastic fashion. Well done to the players.
"My retirement doesn't mean the end of my relationship with the club, I'm able to now enjoy watching them rather than suffering with them. If you think about it, those last-minute goals, the comebacks, even the defeats, are all part of this great football club of ours. It's been unbelievable, thank you for that.
"I'd also like to remind you that when we had bad times here, the club stood by me, all my staff stood by me, the