So, City aren't ideal after all.
The England global contrived to miss from three yards as City dropped two points at Turf Moor but this time made no mistake from a similar distance after just three minutes.
A tougher task awaits at Wembley today against a high-flying Tottenham side, who have not lost in 11 games.
Guardiola named just six substitutes for last weekend's draw at Burnley, protesting that he did not have the numbers due to an injury crisis, particularly in attacking areas, with the club forced to deal with lengthy layoffs for Leroy Sane and Gabriel Jesus. Another victory - their 13th straight Premier League win at the Etihad Stadium - and another prolific day for Sergio Aguero who continued his rich goalscoring form on home turf.
Will he won't he?
"He's an authentic legend of this club", City manager Pep Guardiola said of the striker who clinched City's Premier League title in 2012 with nearly the last kick of the season.
Still, it's not all bad.
"They are so risky with [Jamie] Vardy, [Marc] Albrighton, Mahrez if he plays, with [Shinji] Okazaki". He was the best player on the park.
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You could be forgiven for thinking that the [15.5] about Leicester is a decent price. Couldn't hear the #LCFC fans above the applause from the Man City fans around us.
"Leicester City were always aware of my whereabouts and had knowledge of my thinking either directly or via my advisers", Mahrez said in a statement published by Sky Sports and the Leicester Mercury newspaper.
"Now we have tomorrow (Leicester), three days later the Champions League, then five days (FA Cup fifth round at Wigan), and then five days for the final (Carabao Cup v Arsenal)".
The 26-year-old was said to be quite upset over Leicester's Thai owners rejection of City's proposal of a record KSh 9.4 billion fee, and an unnamed player.
From there, however, City took the control to which they have become accustomed this season, especially at home.
There are reasons to think the [3.2] about under 2.5 goals is value.
"Hopefully we can fight for every game in all competitions".
The return of (David) Silva would certainly give City a boost but there must be some slightly tired legs in the team right now.
After Sterling and Jamie Vardy exchanged first-half goals, Aguero took over and effectively ended the game with two strikes within eight minutes after the break.
"In the Premier League game against them it was hard, the sending off after three minutes changed the game".