Premier League leaders Manchester City recovered from two goals down to beat Championship side Swansea City 3-2 at the Liberty Stadium on Saturday to progress to the FA Cup semi-finals. He was raised in Norway after his family fled the war in Kosovo and was picked up by Manchester City as a teenager and was coached by Patrick Vieria at the club's much-vaunted Academy.
No team has ever won the quadruple of Premier League, Champions League, FA Cup and League Cup in a single season.
Aguero completed the comeback with two minutes remaining, when he stooped to head home Silva's cross from the left to keep City's dream of lifting four trophies this season alive. "When we analyse the game we deserved to win by far".
"That is the best lesson".
Manchester City's torrid form continues with the win, now sitting first in the Premier League table and having demolished Schalke 7-0 midweek to reach the Champions League quarterfinals.
"People will say not winning the Champions League is a big, big failure for this club but I don't understand when this comes from former players - they know how hard it is to win the Champions League or win the title", Guardiola said.
Sergio Aguero was then in an offside position when he scored the victor in the 88th minute, but the Video Assistant Referee was not in use as the game was not being played at a Premier League ground.
The magic of the FA Cup gave way to the crushing inevitability of Manchester City.
Swansea players were unhappy when Cameron Carter-Vickers was judged to have tripped substitute Raheem Sterling for the equaliser, while Sergio Aguero was offside when he headed in the victor two minutes from the end.
City finished the tie off with goals from Bernardo Silva and Aguero either side of a Kristoffer Nordfelt own goal - the Swansea goalkeeper unfortunate that Aguero's penalty attempt hit the post only to hit the back of him and go in.