Haaland settled the contest in the 71st minute when he punished a slip from Kristoffer Ajer, running from the halfway line to slot the ball under the unfortunate Mark Flekken, who had another outstanding match against the reigning champions.

After a week in which Guardiola had to answer questions about the Norwegian star, whose misses proved costly in Saturday's 1-1 draw with Chelsea, Haaland made no mistake with one of the very few clear chances a well-organised Brentford side afforded City on the night.

“If I had to choose one (player), I choose this one," Guardiola said of the moment.

It was Haaland's third goal in seven games since returning from the foot injury that sidelined him for two months. Last week, he mourned the death of his grandmother Tone Rascal, mother of his father Alf-Inge, at the age of 80.

Asked if he had needed to speak to the striker, Guardiola said: “We spoke about the moment and I realised this later, but he didn't say anything about the passing away of his grandmother. We talked about how he feels and of course for his father.

“In this type of game like Brentford, you need Erling. With not much space, you can play with a typical striker."

City struggled to break down a determined Brentford side. Kevin De Bruyne was kept on the bench throughout the night, not even emerging to warm up with the game in the balance, and Guardiola revealed the Belgian playmaker had a hamstring issue, having already missed five months of the season.

“Today we could not use Kevin because he had niggles in his hamstring and I didn't want to take risk," he said, adding: “He's okay. It's just a precaution but he didn't feel comfortable and so after five months off we didn't take any risk."

Brentford had defended doggedly before the goal, more than once having all 11 players inside their own box in open play. Bernardo Silva headed a glorious chance wide before Oscar Bobb created space only to shoot straight at Flekken, but otherwise there were few real opportunities.

Having taken six points off City last season, Brentford threatened to do damage to their title bid again this time before Haaland stepped in – he has now scored against all 21 opponents he has faced in the Premier League.

“I think throughout the game we were brilliant, I'm very proud and pleased with the players' performance," Bees manager Thomas Frank said. “They believed and it gives me a lot of belief in them going forwards.

“The way we defended the whole game was magnificent in terms of structure, defensive principles, urgency. Before the goal, we gave away the header to Bernardo Silva and the Oscar Bobb chance and it was two big chances. If you can limit City to two big chances, you have done a very good job.

“If (Ajer) doesn't slip I'm convinced it would not be a goal. Haaland is quick but Kristoffer is as quick. City are good so they don't need the margins going their way."

Manchester City manager Pep Guardiola highlights Erling Haaland importance after Brentford winner