But United's loss to bottom-placed West Brom probably caught out the club and the players.
Given the way they have demolished all challengers in the league, it was apparent months ago that it was only a matter of when rather than if City would take the title.
It is ironic that United came back from 2-0 down against City themselves last weekend to win 3-2 and delay City's party, only to surrender so tamely on home soil.
It's been held by Manchester United since 2001. It was always a matter of when rather than if City would be champions after they led the way for most of the season. "So, we have to do it, like we have all season".
Juergen Klopp's side were the first to beat City in the league, blitzing them at Anfield with the help of Mohamed Salah, and then embarrassed them in the Champions League. City has scored 93 so far.
There's also the way that their football has been so good, and of such a high and genuinely unique level, that it feels like they should achieve something historic - like a points record - to properly symbolise that; to give it the special resonance it deserves. But tonight, we win it again.
Guardiola's players will focus on those targets once they have recovered from a boisterous evening of celebrations in Manchester.
City captain Vincent Kompany said: "It's the same feeling as the first time and you can't describe it". They are able to win their games - all six.
Apparently a ginger kid can get the entirety of Manchester (which, by the way, doesn't seem to have any United fans anywhere at all) to start singing quite literally the WORST footballing chant the world has ever seen.
"He unlocks everything but when you think about it he did much, much better than last season and that was important".
Unlike Belgian defender Kompany, Guardiola spent Sunday afternoon playing golf with his son instead of watching the United match.
"You can not imagine", Guardiola said on Saturday. There was a period of adaptation for him coming into the league and for us taking in his methods.
"He has been able to transfer to the team that hunger and desire to never be satisfied".
It probably wasn't the flawless way to seal glory, but City won't care too much. He won three league titles with Barcelona and twice lifted the Champions League trophy during his Camp Nou reign.
"It's more complicated. But I think for the club, not just the players, all the departments in the club can believe".
"These guys are fantastic, awesome - they are incredible".
"This club is absolutely wonderful in all terms", he told the club's official website.