Yellow Wiggle Greg Page has asked his bandmates to go ahead with tonight's bushfire relief concert as he recovers froma cardiac arrest that almost claimed his life during a show last night.

"He didn't want to let all the fans down which is surprising considering he is in a hospital bed," director Ben Alcott said.

"You would think he would be worried about his health. But he is the one who asked for the show to go ahead.

The announcement that the show will proceed comes as The Wiggles shared a post to their instagram page to give fans and followers an update on Page's condition.

"We've visited Greg this morning & he wanted to thank everyone for their well wishes. He's so grateful for the messages of love & support from around the world. Greg's main concern was that the show tonight hould go on. Let's do it for Greg whilst raising much needed funds."

A nurse in the crowd and two members of the Wiggles entourage helped save Page's life after he collapsed.

A defibrillator was used three times after Page lost consciousness at Castle Hill RSL Club.

Speaking outside Westmead Hospital, Wiggles manager Paul Field said Mr Page's condition was very serious.

"Everything seems like it takes forever when you're waiting for a paramedic," he said.

"A nurse from the audience came up and took charge. Two of our cast - Steve the drummer and Kim who works in our office - did CPR on him. They saved his life.

"He stopped breathing a number of times. He was not conscious."

Concertgoers were left shocked as the show was stopped as the stage curtain fell, with paramedics rushing to Page's side.

Paramedics and others worked on him for 26 minutes before he was transported to hospital.

It was also revealed Mr Page's shocked parents were in the audience and were led away by security.

Yellow Wiggle Emma Watkins stepped in for Page after he fell down with the yellow Wiggle joining , Field, Fatt and Cook on stage to perform Hot Potato.

"Greg had walked off stage and that's where he collapsed," Brittany Buhagiar, 24 said.

"It was towards the end of the show so they had said their goodbyes then everyone started chanting for them to sing Hot Potato.

"They closed the curtains and said on the mic that Greg was not well.

"After he fell they continued performing. Anthony, Geoff and Murrray and Emma did a quick rendition of Hot Potato.

"Then they said to everyone he is really not well. then they asked everyone to evacuate the hall."

Buhagair said Page looked well and healthy prior to the incident taking place.

"He didn't look unwell so it came as a surprise," she said.

"They all took a water break, but we didn't think that was unusual.

"It was such a great night."

Mr Field said that Mr Page was groggy but talking to him when he saw him in the coronary care ward at about 3am Saturday.

"He can't remember much about it (the show) at all," Mr Field said.

"But he is such a trooper. He asked me 'did I finish the show?'

"I said 'it was a bit of a melodramatic exit but yes you finished the show.'"

Mr Field said he will check with Mr Page's family as to whether the second show will go ahead tonight despite Mr Page's absence.

Mr Page is expected to be in hospital for at least another few days.

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In 1991, Field was inspired to create an album of children's music based upon concepts of early childhood education, and enlisted Cook, Page, and Fatt to assist him.

They began touring to promote the album, and became so successful, they quit their teaching jobs to perform full-time.

When Page left The Wiggles in 2006 due to ill health, he was replaced by understudy Sam Moran.

He returned to The Wiggles in 2012 but at the end of the year Page, Cook and Fatt retired and were replaced by Lachlan Gillespie, Simon Pryce and Emma Watkins.