The new Pope, Francis Xavier, is expected to announce a new strategy for the Catholic Church, with the focus on its social justice mission and strengthening its relationships with disadvantaged communities.
The pope will also announce a series of reforms in his first 100 days in office, including a plan to address the plight of migrant children and families.
However, it is unclear what his policy on abortion will be.
It was not clear if the new pontiff will also unveil a policy to address climate change, a key issue for Catholic leaders, although he has said the church must be “a responsible steward of the Earth”.
In an interview with The Associated Press last year, Mr Xavier said the Church’s social agenda should include environmentalism, human rights and gender equality.
Mr Xavier is expected in Rome on Monday for a private audience with Pope Francis.
The Vatican said he will address the global climate change conference in Rome from Oct 10-11.
“The pontiff, who is expected for the first time to make a major contribution to the work of the Pontifical Council for Justice and Peace, will also address the issues of gender equality, environmental justice and the environment and human rights,” the Vatican said in a statement.
The pontiff’s first public event since becoming pope came on Sunday, when he met with representatives of the US bishops conference and the Vatican office of the pope.
He also met with a group of US nuns.
He will be joined by Pope Francis’ predecessor, Benedict XVI, and his two immediate predecessors: Pope Emeritus Benedict XVI and Pope Francis of Argentina.