"I wanted to exhaust all my options in trying to be an All Black tighthead but, with Owen Franks and Charlie [Faumuina] there and signed on again for a few more years, and Charlie also at the Blues, there's not much room," he said. "I'm lucky I have other eligibility to explore."
The trigger for the move came when Waratahs coach Daryl Gibson got in touch several months ago.
"The Waratahs senior tighthead Sekope Kepu is off to play in France so I'll be in competition with Paddy Ryan to try and get the starting role," Ta'avao said.
Apparently the Tahs' senior loosehead, Benn Robinson, spoke highly about Ta'avao's ability and Wallabies coach Michael Cheika has already been in touch.
"The way it's worked out it's been quite weird but, after thinking about it for a month and talking to people, it felt the right thing to do," Ta'avao said.