He once declared that he wouldn't trust Australia's government-owned shipbuilder to build a canoe — now former defence minister David Johnston has been appointed to sell Australian defence products to the world.

Key points: David Johnston once declared that he wouldn't trust Australia's government-owned shipbuilder to build a canoe

David Johnston once declared that he wouldn't trust Australia's government-owned shipbuilder to build a canoe He's been appointed to sell Australian defence products to the world

He's been appointed to sell Australian defence products to the world Christopher Pyne said he brings a "wealth of experience and knowledge"

Mr Johnston has been appointed as the nation's first Defence Export Advocate by Defence Industry Minister Christopher Pyne.

The part-time role is for two years, with Mr Johnston's pay cheque yet to be revealed.

"As a former minister for defence, Mr Johnston brings a wealth of experience and knowledge of Australian defence industry to this significant role," Minister Pyne said.

"I work tirelessly to advocate for Australian industries looking to sell their world-class defence materiel to our friends and allies but I can't be everywhere.

"Our Defence Export Advocate will help connect Australian industry to overseas governments and defence forces, build relationships in our key markets and act as a focal point for long-term campaigns."

As defence minister in 2014, Mr Johnston raised the ire of Australian shipbuilders after declaring he lacked confidence in the Australian Submarine Corporation (ASC) during a Senate debate about where Australia's future submarine fleet should be built.

"You wonder why I'm worried about ASC and what they're delivering to the Australian taxpayer, you wonder why I wouldn't trust them to build a canoe?" the former Senator said.

Mr Johnston was sacked as defence minister weeks after making the comments and lost his seat in parliament at the 2016 federal election.

He later changed his tune on ASC's performance declaring the shipbuilder's performance had dramatically improved.

Mr Johnston also advocated on the company's behalf, questioning why ASC and fellow Australian shipbuilder Austal had apparently been locked-out of negotiations to win work on Australia's $35 billion Future Frigate program.

Christopher Pyne said he "can't be everywhere". ( William West, file photo: AFP )

"We have a world-class shipbuilder in Austal, teaming with ASC who has come out of the doldrums — it had a lot of problems when I was the minister, a lot of problems, and now it's doing world-class work," Mr Johnston said.

"Why are we not getting them to participate in this?

"I find it very, very curious."

The federal government is set to announce the successful tenderer for the frigate program within months.