The 25-year-old has now scored nine of City's league goals this season, with a total of 15 goals in 13 games across all competitions.
No other City player has scored more than one league goal in their opening eight games, prompting Guardiola to emphasize the need for his team's other players to contribute more.
Speaking after the game, Guardiola acknowledged Haaland's importance, saying, "He could have scored four or five at the end. He's our key man."
However, he also emphasized that the team cannot achieve success solely relying on Haaland's goals. "We cannot do good things with just Erling," he said.
Guardiola expressed confidence in his team's ability to create scoring opportunities, citing the performances of players like Savinho, Jeremy, and Tijjani, who had two chances each.
He urged his players to capitalize on these chances, saying, "They have to score goals. We have to score more. If we don't create it's fine, but when we create, we have to score."
Guardiola is convinced that his team has the potential to score more goals, citing the skills of players like Omar, Savio, Oscar, and Phil, who are capable of scoring in their respective positions.
He is confident that, with Haaland on board, the team will become stronger and more effective in front of goal.