Back in action for the first time since their first top-flight defeat of the season at Liverpool, the Premier League leaders were 2-1 up but enduring a nervy spell in Saturday's home match against Newcastle United.
But Guardiola says he understands why clubs spend so heavily particularly after his near-£200m outlay in the summer to overhaul the City squad.
With regular left-back Fabian Delph out injured, Guardiola decided against picking Danilo to replace him instead opting to play natural winger Oleksandr Zinchenko.
Further chances fell to Newcastle as they threatened to pull off a shock comeback, yet Aguero killed off their hopes with a fine 83rd-minute finish after Leroy Sane's incredible solo run, ensuring City again opened up a 12-point lead at the top of the table.
Jose Mourinho's men reduced the deficit to 12 points following their comfortable 3-0 victory over Stoke on Monday night.
In 16 matches, Mata has three goals and three assists, though his value is through more than the point output.
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Addressing the large congregation at the outset, Bishop Leahy said: "In blessing the remains of Dolores O'Riordan here in St. Ole Koretsky, O'Riordan's partner, who also played with her in the alternative rock band D.A.R.K., was also present.
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"To win 10 games will be tough because every team plays for something - to stay [in the Premier League], for the Europa League, for the Champions League. You have two choices - to see what happens behind or to see the 10 games we have to win [to become champions]", he told reporters. It is complicated to attack 11 players when they defend so deep and they can hit you on the counter-attack.
The former Barcelona and Bayern Munich coach added: "When we lost 4-3 against Liverpool, we congratulated Jurgen Klopp and his team and moved forward". I said to them, until fixture 24 we were the best team.
"We reacted really well after dropping points before".
"Still we have 42 points to play".
"We are not going to buy another striker", he said.
"Hopefully, we will keep going the same way". De Bruyne picked the ball up on the left and clipped a cross into the opposition penalty area, with Aguero getting the faintest of touches to glance the ball home.
On that occasion Burnley managed just three shots on target the whole game but two of them found the net and it required a fightback from United to come away with a 2-2 draw.