Yellow Wiggle Greg Page will be out of action indefinitely, as the children's entertainer continues to undergo tests for a mystery illness.
Page, 34, has been undergoing medical examinations since June, when he pulled out of the group's tour of the US after experiencing symptoms such as fainting and lethargy.
With Page still sick and the group touring the United States again, he has been replaced by understudy Sam Moran.
"It is frustrating for Greg and his family," said Wiggles manager Paul Field - brother of Blue Wiggle Anthony Field.
"It is not something that we can put a time limit on.
"Tests are ongoing but they have been for a while and we have to just be patient and wait until they find the root cause of these episodes."
Mr Field said Page was simply not fit enough to perform the rigorous routines required for a Wiggles stage show.
"It is a pretty full-on workout, the Wiggles shows. You need to be 100 per cent fit and he's not," said Field
"Greg's condition is that he is fairly tired and he's had some fainting episodes. He's able to walk around and do stuff but he's literally not fit enough to tour."
Following the US tour, the Wiggles will conduct a tour of Australia with their Race To The Rainbow stage show.
The Wiggles formed 15 years ago and have won countless awards in Australia and overseas.
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