They got off to a horrible start at the Eithad Stadium as they went 2-0 down but mounted a stunning late comeback once again to win 3-2 and against Aston Villa, pipping Liverpool to the Premier League title once again.
It was a momentous day for City and emotions were high, especially in the manner they claimed top spot.
The stands emptied and fans ran onto the pitch to celebrate, with pitch invasions becoming a huge talking point over recent days.
A Nottingham Forest fan was jailed for an attack on Billy Sharp, while there were also further incidents involving Everton and Crystal Palace.
And it's emerged that Olsen, who stood in for Emi Martinez between the sticks, was attacked during the pitch invasion.
"Manchester City would like to sincerely apologise to Aston Villa goalkeeper Robin Olsen, who was assaulted after the final whistle at today's match when fans entered the pitch," City said in a statement.
"The club has launched an immediate investigation and once identified, the individual responsible will be issued with an indefinite stadium ban."
Pictures showed the goalposts at the Etihad had been broken with talkSPORT host Adrian Durham describing the scenes as similar to when Scotland fans stormed the Wembley turf in 1977.
"Where Manchester City scored their three goals, the crossbar has been broken," Durham said. "It is like the Scots at Wembley in the 70s. The crossbar has been broken, it has been snapped away to our right.
"The pitch is being cleared, I think they realise there will be a title celebration. That's where the goals were scored. They probably want a memento.
"There's no indication it is hooliganism and violence or any trouble. It's just fans swinging on it and sitting on it. That has now snapped.
"The pitch is being cleared, I think they realise there will be a title celebration. That's where the goals were scored. They probably want a memento."
Micky Gray added: "They probably do. You don't want to put a dampener on someone winning the Premier League and how this Premier League has panned out.
"You talk about supporters coming onto the pitch, and we talked about it before this game actually, in front of me there was a boy who got barged over and was crying his eyes out. His father went over and got him away from the supporters who were around the young man.
"There was a lady steward, she got barged to the floor. It's a long season and I'm not being negative, but I'm keen to point out things I'd wished hadn't happened.
"We don't want to see that. We don't want to be talking about that. We want to be talking about a fantastic day for Manchester City.
"They are picking up the Premier League, back-to-back, but we have to highlight that."