The Norway striker offered his apologies to fans after City's shock Champions League defeat at Bodo/Glimt.
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But ahead of today's clash with Wolves, Guardiola insisted: "He's not going to apologise.
"He does his best and he tries, even if the team doesn't win.
"It's not about a player. It is all. He should not apologise. He can apologise to himself and continue to give everything."
Haaland has scored 26 goals already this season.