Barnaby Joyce has flagged possible changes to a landmark Pacific-wide trade deal agreed to last week if needed to bring the United States on board.
Australia, New Zealand, Canada and Japan are among the 11 nations that agreed on Tuesday to the Trans-Pacific Partnership, which was thrown into disarray last year when US President Donald Trump pulled his country out.
Prime Minister Malcolm Turnbull was lauding the deal for much of last week, saying it would be signed in Chile in March.
But the deputy prime minister says the agreement reached isn't yet final.
"As it's not signed yet I don't want to say these positions are finalised," Mr Joyce told Sky News on Sunday.
"The final draft of it, I hope, is determined once the United States is part of it."
If minor changes were needed to bring the US back on board, he thought that should be done.
"Major changes would then change everybody's position but obviously if we can get the United States to be part of it ... then we will," he said.
Having slammed the door shut on the deal a year ago, Mr Trump this week surprisingly flagged the possibility of re-joining "if we made a much better deal than we had".
Mr Turnbull said on Friday he didn't expect the US to return to the trade pact anytime soon and Australia wasn't counting on that happening.
The agreement would eliminate more than 98 per cent of tariffs in a trade zone with a combined GDP of $13.7 trillion.
Australian farmers will be able to sell more beef, cheese, wheat and rice to Japan and more sugar to Canada and Mexico while businesses can export their services to more customers more easily.
Mr Joyce - who was the agriculture minister until December - is yet to see the full details of the deal although he is aware of the agricultural components.
Labor has criticised secrecy around the deal and wants the Productivity Commission to be allowed to analyse it.
"In an era where people are sceptical about trade deals, it would help the government, and I think it would be good for Australia if we had an independent report saying here's the benefits, here's where the jobs will be created," opposition trade spokesman Jason Clare told ABC TV.
Mr Joyce said he had faith those central to striking the deal knew what they were doing and "would not set us up with a dog of a deal".
A Sky News-ReachTEL poll released on Sunday found two in five Australians thought trade deals were good for jobs while nearly the same number were undecided.
One in five thought they were bad for jobs.