Waratahs second-rower Kane Douglas has confirmed he will leave Australian rugby a little more than a year out from the World Cup.
Douglas, a 13 Test Wallaby, will join Irish province Leinster on a two-year deal towards the end of the year.
In a sign his services would still be required by the Wallabies, a statement from Leinster said Douglas' start date would be confirmed at a later date.
"I value the Wallaby jumper and cherished every moment when wearing it," Douglas said.
"Who knows, one day down the track I may be considered good enough to wear it again.
"It's a big decision but one which I am extremely comfortable with.
"I've had plenty of time to weigh lots of things up and the time is right for me and my partner Jennerly to experience something new and something totally different.
"It's exciting for both of us."
Douglas said he was comfortable with the ARU negotiation process, and was focused on helping the Waratahs make the Super Rugby semi-finals.
"I'll be giving it everything I've got and I'm totally focused on doing my very best for the Tahs for the remainder of the year."
Douglas said he had discussed his decision with ARU chief Bill Pulver.
"I've had a chat to him and reaffirmed my passion for the Wallabies," he said.
"I am available this year if they consider me good enough for selection but what will be, will be."