In a highly anticipated Barclays Premier League top-three clash at the Etihad, Manchester City fell 3-1 to league-leaders Chelsea.
While an act of violent conduct usually carries a three-game suspension, Aguero has, as anticipated, incurred an extra match after being retrospectively banned for elbowing Winston Reid during August's victory over West Ham United.
"It is a pity the game finished like this", Guardiola said afterwards.
"I can't like the Aguero challenge".
"[Fernandinho] went to defend his teammate".
Nevertheless, for the neutral at least, the chaos Aguero brought about with his reckless tackle on Luiz added an extra bit of spice to what was already a brilliant game of Premier League football.
Guardiola used a 3-4-3 formation to counter Chelsea's 3-4-3 of their own.
Heated arguments, pushes and shoves engulfed what had been a thoroughly entertaining game up to that point, with managers and match officials having to physically restrain players and calm them down.
"I am proud of my team and how we played - I came here to try to play the way we played in this game".
"We play good, faster than in Munich and even in Barcelona, when we had one player, [Lionel Messi] who was wonderful and helped us to help us create those steps", Guardiola told a news conference ahead of City's Champions League clash with Celtic on Tuesday. "In the box, we're not strong enough", Guardiola said after the match.
"It's a big win and a big result against a really strong team, with the quality of players in their squad I think it's the most complete in this league". Although, this is also the Brazilian's second red card of the season, his first came in a Champions League match against Germany's Borussia Monchengladbach.
With his strike, Costa has scored a total of 11 goals in 14 league games as he tops the league scoring chart, one ahead of Aguero.
Manchester City: Claudio Brave 5, Nicolas Otamendi 5, John Stones 6, Aleksandar Kolarov 5, Fernandinho 5, Ilkay Gundogan 6, Leroy Sane 5, Jesus Navas 6, Kevin De Bruyne 7, David Silva 6, Sergio Aguero 6.
The tackle from Aguero was absolutely outrageous. "It is normal in football - when you win you be happy, when you lose you be sad". It was the type of challenge that can break a leg. "You are going to analyse. we lost 3-1, but I prefer to play that way, rather than against Burnley and Crystal Palace where we won but we didn't play well".
Chelsea looked no weaker defensively in the absence of Matic, despite him being more of a specialist in a two-man midfield than Fabregas. City lost their discipline at the end, which will disappoint Guardiola. And now Aguero will be banned - that will be massive.
As can be seen towards the end of the video above (seek to 8:39), Fernandinho was way too aggressive towards the Chelsea man and fully deserved his dismissal.
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