The Wallabies have been dealt a stunning blow eight months out from this year's World Cup, with assistant coach Scott Wisemantel making the "very difficult decision" to resign.

Wisemantel has been part of the Australian coaching setup for about three years, having re-joined the national team before the 2020 test campaign.

The veteran coach, who has 20 years of experience to his name, worked alongside Eddie Jones at England, before returning to Australian shores.

In a statement from Rugby Australia, it was revealed that Wisemantel has left his role immediately, so he can do what's "best for me and my family."

"While this has been a very difficult decision, it's one that's best for me and my family at this point in time," Wisemantel said. "The World Cup is the pinnacle of our sport and requires 100% commitment, and that's something that I'm unfortunately unable to give at the moment.

"I've loved being with his team under Dave and wish them all the best for their season and in the World Cup later this year."

After a disappointing international campaign last year, this news has come as a shock, as the Wallabies look to turn their fortunes around ahead of the sports premier event.

Introducing your #1 Wallabies try of the year 🤩

There was no beating this incredible coast-to-coast try!#Wallabies @eToroAU pic.twitter.com/MQljP6oVMI

— Wallabies (@wallabies) December 23, 2022

Coach Dave Rennie said the Wallabies will "miss" Wisemantel, who has "been a massive part of this group" for a few years.

"Scott's a top man and one of the best coaches I've ever worked with," Rennie said. "He's hugely respected around the world, has a mountain of experience at the international level and an incredible rapport with our players.

"While we did all we could to try and keep Scott, we respect his decision and wish him, Gabs and the girls all the best.

"He's been a massive part of this group for the past three years, and we'll miss him."

According to the statement, Rugby Australia will begin the process to find Wisemantel's replacement.

"A process will now be undertaken to find a replacement to fit into the Wallabies coaching structure and any additions will be communicated in due course," it read.