It's always useful to have Sergio Aguero by your side.
More often than not, the Argentine's goalscoring exploits are enough to get anyone out of trouble - especially at the Etihad, where Manchester City have scored 56 times in their last 13 games.
And Aguero was City's saviour yet again on Saturday, as one of his trademark hat-tricks inspired a 4-2 comeback win against Watford.
But City boss Pellegrini was still worried during a first half that saw his side go 2-0 down, even claiming he would have made 11 substitutions at the break if he could.
"If I could change 11 players at half-time I would have done," he told reporters.
"I was very worried at half-time because I talked with the players a lot before the match and said that, in the FA Cup, teams that play in a lower division have a lot of motivation.
"If you don't play with 100 per cent intensity and desire you can lose and go out of the competition and we were jogging in the first half - if you play like that, you can't win.
"I didn't underestimate Watford; I didn't think it would be easy and I told the team this. The players must not believe they have an easy game but I feel that they had a very good reaction in the second half.
"We changed everything; we played with tempo, with pace. We continued playing in the same way we've played in this whole season at the Etihad. This reaction was very important.
"The whole team didn't do the things that we normally do in the first half, the most important thing for me is that Watford didn't score the third goal. If they'd have scored that, the game would have been finished."
Luckily for Pellegrini, Aguero & co. (Aleksandar Kolarov grabbed the third of four goals) saved City from potential humiliation.
The quadruple is still on...
image: © geetarchurchy