Former All Black coach John Hart has hit out at current coach Ian Foster's critics as the team shows encouraging signs heading into the Rugby World Cup.

Foster came in for intense scrutiny and criticism last year as the New Zealand side sometimes struggled to meet their high standards.

The All Blacks have impressed in going four-from-four to start their 2023 campaign and Hart told Mike Hosking the critics have been proven wrong.

"The All Blacks were supposedly in disarray, Foster was an idiot. He's done a brilliant job of bringing together his coaching team, his selection team."

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