United had to at least draw to keep the title race mathematically alive but were stunned at Old Trafford when Jay Rodriguez headed home after the break.
Watching the Red Devils lose to West Brom, a result which handed the title to the Citizens, City captain Kompany was with his wife Carla Higgs and her family, which includes her United supporting dad. What a great feeling!
An unbelievable comeback in the Champions League final, where goals from Teddy Sheringham and Ole Gunnar Solskjaer in the final seconds secured a 2-1 win over Bayern Munich, was the crowning glory for Ferguson as he finally got his hands on Europe's elite club prize. You could see the difference in the attitude to players compared to last week.
"I saw lots of people in the moon because we won against City".
"We did it! An fantastic journey to get here". So sometimes you have to do these kinds of things to think, "Wow, we are good too, like the other ones"'. "Very happy to call us champions this year!"
"For all Manchester City supporters, at home and globally, it is time to celebrate, acknowledge our friendship and enjoy our passion together". "We want to stay humble about the fact that it's not a dynasty.it's one title and there is still so much work to be done before the full potential is unlocked".
They are still on course to become the first club to hit 100 points in a Premier League season, breaking Chelsea's 2004-05 record haul of 95 points in the process, and they are also in with a chance of surpassing Chelsea's 2009-10 mark of 103 league goals in a season.
He won three league titles with Barcelona and twice lifted the Champions League trophy during his Camp Nou reign.
And the 2003-04 Arsenal side remain the only team to go through a Premier League season unbeaten, so there are some achievements that this City team has been unable to chalk off.
He also conceded it was sweet to triumph in a country where some critics claimed his purist principles couldn't flourish.
For no English champions have successfully defended their Premier League crown since City's once lordly neighbours United won the title for a third straight season in 2008-09.
After two relatively low-key wins in their first three matches, this stunning demolition of Liverpool served as an early sign that City were a different proposition from the team that struggled to impose themselves the previous season.
With a World Cup to come, who could blame their players if they did? Probably because I won eight championships, I was not in the moon with the victory against them.
Fuelled by the majestic form of Kevin De Bruyne, David Silva, Sergio Aguero and company, City have sent records tumbling, including notching an incredible 18 successive top-flight wins.