Aguero on mark as City march into FA Cup round four
Manchester City's Sergio Agüero (R) and Blackburn Rovers' Adam Henley pictured during their FA Cup match in Manchester on January 15, 2014
Held 1-1 at Ewood Park in the initial tie, City took control of the replay at a rain-soaked Etihad Stadium Wednesday thanks to a brace of goals either side of half-time from Alvaro Negredo.
Edin Dzeko added a third before Aguero scored only 50 seconds after his introduction as a 72nd-minute substitute, following a month on the sidelines with a calf injury.
Dzeko brought up City's 99th goal in all competitions this season to make it 5-0, leaving Blackburn's Championship counterparts Watford with plenty of food for thought ahead of their trip to the Etihad in the fourth round.
"It's an important amount of goals," said City manager Manuel Pellegrini.
"When I arrived here it was important to try and win a trophy, but in the way this team must play, and it's important for the fans to come here and know that we are going to try and score the most amount of goals we can."
Pellegrini said that he was happy to be spoilt for choice by his three in-form strikers.
"For me that's not a problem," said the Chilean. "It's a problem when you don't have the players to choose.
"Alvaro and Edin Dzeko are in a very good moment. It's very important for the team that Sergio comes back today and he scores in this game.
"We have so many games in the future, we have no problem with the three."
Pellegrini made eight changes to the team that won 2-0 at Newcastle United on Sunday and his new-look side initially struggled to make inroads.
Dzeko snatched at a handful of early chances and a free-kick within shooting distance offered Blackburn an opportunity to strike at the other end, only for Ben Marshall to curl his shot straight at Costel Pantilimon.
Belatedly, City began to muster more of a threat, with Javi Garcia forcing Blackburn goalkeeper Paul Robinson into a sprawling save from long range and Jesus Navas bending an inviting cross across goal.
Blackburn had largely succeeded in keeping their opponents at arm's length, but with the respite of the half-time interval within touching distance, City struck.
Navas's pass found the overlapping Fernandinho and the Brazilian's whipped cross enabled Negredo to claim his 20th goal of the season with a firm downward header.
Pellegrini introduced Aleksandar Kolarov for Fernandinho at half-time and the first thing the Serbian did was create City's second goal with a superb searching pass from halfway that Negredo lifted past Robinson.
The timing of Negredo's second goal was every bit as cruel as his first, but Blackburn briefly threatened to make a game of it.
Joshua King headed over and then forced Pantilimon into a smart low save at his near post, before Jason Lowe shot narrowly wide.
The flurry passed, however, and Dzeko made the game safe in the 67th minute when he swept a shot high into the net at the near post from Navas's low cross.
Aguero came on for Negredo and needed only two touches to make his mark, trapping a lay-off from Dzeko and swivelling before planting a low shot in the bottom-right corner with his left foot.
Dzeko added a fifth with 11 minutes remaining, finishing at the near post after the irrepressible Navas drove yet another excellent cross into the box from the right.
"You saw the difference in the Championship and the Premiership (Premier League)," said Blackburn coach Gary Bowyer.
"That was clinical finishing, and you can see why they score so many goals."