He said: "I think days off are to be happy".
He also cast doubt on Aguero travelling to Argentina for World Cup qualifiers next month. If they decide to go there, they decide to go there. If you want to just use him as a "set and forget" player that's definitely valid, but there are certainly better value options out there.
"I don't know what the supporters think". They can enjoy their lives.
"I only knew [about the accident] this morning when I woke up. It is OK for me".
Asked whether he had a problem with Aguero attending a concert ahead of the top-of-the-table game at Chelsea, he replied bluntly: "No. Day off".
"There's a small bend in the street right there and presumably the chauffeur lost control of the wheel", said a spokesman.
He added that the three people in the taxi "have been transferred to hospital for observation... but there were no bad injuries".
On Thursday, Aguero posted a picture on Instagram of himself alongside Colombian singer Maluma, saying: "Thanks for the invitation!"
The members of the Independiente, a club in which Sergio once played, sent him wishes of quick recovery, strength and good health. "All @Independiente is with you at this hard time". The Argentine, who was on a day off, made the trip to see a concert, even though it was less than 48 hours before City face Chelsea at 5.30pm this evening at Stamford Bridge.
The worldwide break follows the weekend's Premier League matches with Aguero in Argentina's squad for their last two World Cup qualifiers against Peru and Ecuador on October 5 and 10.
The news follows further bad updates on injuries to left-back Benjamin Mendy and captain Vincent Kompany.
Guardiola says he has already spoken to Belgium boss Roberto Martinez and insists the centre-back is only meeting up with his compatriots to have a meeting, rather than to play.
"Kompany? No way. He didn't make one training session with us since one month ago", he said. "He can not play tomorrow".
Aguero, 29, had started the season impressively, scoring seven goals in eight appearances to move within one of equalling Eric Brook's club record 177.
Argentina are fifth in the South American group standings for Russian Federation 2018 and need to move up a place to avoid facing a home and away playoff against New Zealand.
"They shoot four times and score four goals against Tottenham".