However, the Argentine has six goals in as many games in all competitions this season, and has formed a lethal partnership with Jesus to catapult the red-hot blues to the Premier League summit.
Guardiola is certain that his team have all the talent necessary to take on anybody, but feels that getting the mental side of their game right is the key.
There was the memorable FA Cup game in January 2014 when Fernando Forestieri and Troy Deeney put Watford 2-0 up at the break and it was not until the 78th minute that Sergio Aguero pulled City level, and the 86th minute that Aleksandar Kolarov's put them ahead.
Richarlison had the first decent chance of the game but with City guilty of some awful defending, the Watford star sent a free header wide.
Watford face Manchester City at Vicarage Road tomorrow as they look to continue their promising start to the Premier League season.
Playing up front alongside Sergio Aguero and Gabriel Jesus, and well serviced by the likes of Kevin De Bruyne and David Silva, Silva helped City run the Dutch champions ragged in their Group F opener.
The Hornets have looked very hard to beat under Marco Silva this season, and this could be a potential banana-peel for Pep Guardiola's side.
While City went on a rampage Burnley were once again the bane of the big clubs.
Manchester City performed incredibly this week, scoring a total of 15 goals in three matches.
Manchester City, on the other hand, have been imperious at the start of this season, with three wins and a draw in the league, in addition to handing a 4-0 thrashing to Feyenoord in their Champions League curtain raiser on Wednesday.
He added: "On Saturday, it's still important that everyone keep their feet on the ground". "They made an wonderful start".
Had Watford won this match they would have ended Saturday top of the table themselves; the last time that happened was in September 1982, following an 8-0 defeat of Sunderland. Liverpool had chances to get the full three points, it just didn't take them.