Sir Alex Ferguson said today's Manchester United trophy parade topped the celebrations in 1999, when the club won an unprecedented treble.
Speaking to the thousands of supporters who gathered to celebrate the club's title success, he said: "What a turnout, absolutely fantastic.
"I thought that '99 (when Manchester United won the treble) could not be beaten but you've beaten it today, absolutely fantastic.
"All of you thank you for the fantastic support, we're proud of you and the players are a magnificent bunch of lads and I hope I'm here to witness this many, many times again.
"So, well done, good luck."
Manchester United striker Wayne Rooney received a mixed reception during the club's trophy parade today.
Sir Alex Ferguson confirmed yesterday that the 27-year-old had handed in a transfer request but the club were not going to sell him.
When the striker received the trophy, the crowd reacted in a mixed fashion with some booing him and others chanting his name.
Sir Alex Ferguson thanked Manchester United fans for the rousing send-off he received yesterday, saying it was a moment he would "never forget."
Speaking at the trophy parade outside Old Trafford, he said: "This is fantastic, I'm really more pleased for you than anything else.
"We've been through a 38 week programme of the Premier Division and won it, and won it in style with a great bunch of players.
"It's a young squad, a lot of good young players and they're going to get better and the big test is to win three titles in a row, so I hope thy're going to do that.
"Yesterday was a day I'll never forget and I thank you for that, it was wonderful, all my family will never forget it, particularly my grandchildren, it'll live in their memories for many, many years."
Manchester United fans have gathered outside Old Trafford to see their team parade the Premier League trophy.
Manchester United defender Rio Ferdinand said the squad celebrated lifting the Premier League trophy with "sing songs" on a "decent night out".
Just rolling in the front door! Decent night out celebrating that was! Roll on 2mo with the parade!! Sing songs galore!
An open-top bus tour will parade through the city later today, beginning at Old Trafford at 6pm.
Manchester United players have been celebrating winning the Premier League. Their victory against Swansea City meant that Paul Scholes and manager Sir Alex Ferguson were able to retire on a high.
Sir Alex Ferguson said he made the decision to retire from football last Christmas after his wife's sister died.
He told Sky Sports: "Things changed when Cathy's (Sir Alex's wife) sister died, she's isolated a lot now and I think I owe her a lot of my own time.
"For 47 years she's been the leader of the family, looked after our three sons and sacrificed for me, now she's got lots of grandchildren, they all dote on her and I think she's lost her best friend, so I think I owe her time.
"Also, it is important to go out a winner, that is really important at this club."