Sir Elton John's Mt Smart concert on Tuesday postponed

Sir Elton John has postponed his Mt Smart Stadium concert tomorrow to give him an extra day to recover on medication after he was diagnosed with "walking pneumonia".

He will now perform on Wednesday 19, instead of Tuesday 18.

"I'm looking forward to seeing you on Wednesday and Thursday evenings at Mt Smart Stadium," Sir Elton said in a statement.

Sir Elton was forced to cut Sunday night's Farewell Yellow Brick Road show short after his voice gave out 16 songs into a 25-song set list.

The music legend told the crowd he had been diagnosed with "walking pneumonia" earlier in the day.

But despite efforts to battle through his set, he was forced to call a halt.

"I've just completely lost my voice - I'm so sorry," he said, looking very emotional before he was helped off stage.

He took to social media afterwards saying he "gave it all I had".

"I was diagnosed with walking pneumonia earlier today [Sunday], but I was determined to give you the best show humanly possible," he said in an Instagram post after the concert. "I played and sang my heart out until my voice could sing no more."

A statement from Sir Elton's promoter says all tickets remain valid for Wednesday's show.

"If you are unable to attend the Wednesday show, please contact Ticketmaster to request a refund," it read.

Limited tickets are still available for Elton's show on Thursday 20 February.