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The distraught performer was forced to call off his first Auckland concert midway through the performance on Sunday night after suffering pneumonia and losing his voice.
"I'm sorry, so very sorry," a sobbing John told the Mt Smart crowd.
But a statement released through a publicist this morning said: "Elton John was disappointed and deeply upset at having to end his Auckland concert early last night.
"He is resting today, and doctors are confident he will recover.
"At this stage, all remaining shows will go ahead as planned."
He is to play his second and third Auckland concerts on Tuesday and Thursday. He earlier played two concerts at Mission Estate Winery in Napier - jetting back for the Oscars in Los Angeles in between.
NZ Herald writer Tim McCready caught the moment that John could not go on:
The superstar, who earlier needed medical assistance while on stage, broke down in tears and needed to be assisted from the stage after attempting to launch into Daniel, but having no voice left.
The song was number 16 in a 25-strong playlist at Mt Smart Stadium. Concert reviewer Karl Puschmann said John's voice remained powerful during his early songs - until he spoke.
John reached out to fans on Instagram and Facebook an hour after the show was called off.
"I want to thank everyone who attended tonight's gig in Auckland. I was diagnosed with walking pneumonia earlier today, but I was determined to give you the best show humanly possible. I played and sang my heart out, until my voice could sing no more.
"I'm disappointed, deeply upset and sorry. I gave it all I had. Thank-you so much for your extraordinary support and all the love you showed me during tonight's performance. I am eternally grateful."
He signed the message off saying "Love, Elton xx".
There were no announcements and John remained on stage. After several minutes and without speaking, John continued the concert with the song Levon.
The large screens flanking the stage had briefly gone dark but within minutes the concert resumed - to wild cheers from the crowd at Mt Smart Stadium.
He struggled to perform Candle in the Wind and told the audience he did not know how long he could continue as he "had nothing left". He left the stage just after 9pm and the stage, screens and stadium were left in darkness.
However he managed to return to the stage about eight minutes later in a new costume.
But several songs later, as he started Daniel, it was clear he had no voice. The show was over.
The condition is not as severe as the other forms of pneumonia and in most cases hospitalisation and bed rest are not required for recovery. It goes unnoticed and feels similar to the common cold for most individuals.
John has resumed his tour of New Zealand after jetting back from Los Angeles to attend the Academy Awards, where he won an Oscar.
On Saturday night he had performed at the Mission Estate Winery in Napier to a packed crowd, with scores of fans arriving early in a bid to get the best vantage point possible.
Most fans seemed far from upset from the Sunday night cancellation, instead praising the 72-year-old's work ethic on social media.