The ACT's Katy Gallagher has been promoted to the federal opposition frontbench.
The announcement was made late on Friday by Labor leader Bill Shorten.
Senator Gallagher is not expected to find out her portfolio responsibilities until after the next Labor caucus meeting in Canberra on Tuesday, October 13.
She said she was excited by the elevation to the frontbench team.
"I'm really excited to be given the opportunity to serve as part of Labor's shadow ministry and I appreciate the support that I have received from my colleagues for that role," she said.
"I said when I left the role of chief minister to fill the Senate vacancy that I wanted to contribute to Bill Shorten's Labor team and to stand up for Canberra. This new opportunity will allow me to do just that."
The Member for Rankin, Jim Chalmers, will also join the opposition frontbench.
Mr Shorten needed to fill two vacancies after the retirement of Bernie Ripoll and Senator Jan McLucas.
Mr Ripoll has been Labor's representative for financial services, superannuation, sport and Mr Shorten's assistant for small business matters.
Senator McLucas has been the opposition's spokeswoman on housing and homelessness and mental health.
Only two nominations were received, from Senator Gallagher and Mr Chalmers, believed to be after discussions with the party's factions.
Mr Shorten may reshuffle his team to match the new cabinet led by Prime Minister Malcolm Turnbull.
"Labor is ready for an election, ready to put forward our big ideas to the Australian people to judge," he said.
Mr Shorten described the pair as "outstanding nominations" who would be welcomed to the frontbench team.
"The addition of Jim and Katy allow Labor to present our team for government to the Australian people, whenever the election may be," he said.
"These two highly talented, highly intelligent individuals will bring new enthusiasm and ideas to Labor's future-focused agenda.
"Senator Katy Gallagher, the former chief minister of the ACT, brings a wealth of experience to the Labor team.
"Katy replaced former ACT senator and Labor minister Kate Lundy and epitomises Labor's core values through her relentless pursuit of quality health care and education for all Australians.
"The allocation of portfolios will be announced following the next Labor caucus meeting."
Last week it was believed Senator Gallagher was making a low-key move towards the frontbench, amid the distraction of the Liberal Party leadership turmoil.
Asked then whether she hoped to secure a frontbench position, she said she was talking about the issue with colleagues.
It was clear last December when she signalled her move to federal politics that Senator Gallagher could use her credentials as Australia's longest serving health minister to take on some responsibility in the health sphere.