The City boss confessed feeling "shame" following an exchange with a TV crew member subsequent to the Citizens' loss away to the Magpies on Saturday.
When the match concluded, a visibly upset Guardiola entered the St James’ Park pitch and had heated discussions with the referee, Sam Barrott and Magpies midfielder Bruno Guimarães, while also handling the headphones of the camera operator.
"I apologised," Guardiola stated. "I'm humiliated, regretful, looking back. It's not acceptable. I immediately apologized to the cameraman. That's just me. After 1,000 games I'm far from perfect, errors happen."
"One thing is certain, I defend any team and my club, that’s for sure. The reason why I support my squad is clear – because from my experience to clinch the title we need near-perfect totals, high nineties, otherwise we don’t win it."
City are third and trail leaders Arsenal by seven points following their fourth loss this campaign. "Losing four games out of 12 we have to improve a lot," he conceded. "Mathematically, it’s possible still achieve all."
The manager was asked about a potential quadruple could be achieved, Guardiola answered: "You are an experienced journalist, have you ever heard me about the quadruple last winter during our historic run? Never."
On the subject of his talk with the Newcastle player, the coach explained: "I've known him a long time and post-match, home or away, we converse. We often meet and I always have a good relationship. I love it. I’m an emotional guy, I like discussing and gesticulate."
He wouldn't mind should a rival coach addressed his squad immediately after a game. "No - as long as you talk with respect as I do, it’s not a problem," he noted, before referencing Barrott. "He was part of it for 95 minutes, 98 minutes, constantly. My God, very much so."
The team felt aggrieved that Barrott or the VAR denied a spot-kick on a Schär tackle against Foden, while they also questioned Bruno's positioning when Harvey Barnes scored Newcastle’s 70th-minute winner. Subsequent images show he was level.
He will manage his century in Europe against Bayer Leverkusen this week. "That's impressive, it means that every season annually," he commented.
City have 10 points after four games of the league phase, and Leverkusen hold five.
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