The PML-N is waiting for the upcoming presidential address to parliament before making a decision on the future of its relations with the ruling Pakistan People's Party.
Zardari is scheduled to address a joint sitting of parliament this weekend. The PML-N is looking forward to an announcement on the implementation of the 17th Amendment and the Charter of Democracy (CoD).
"We want concrete actions-mere promises will not serve the purpose. If President Zardari makes some concrete announcements with definite timeframe we are ready to work together," the Daily Times quoted a PML-N leader, as saying.
The PML-N leaders have told Prime Minister Yousuf Raza Gilani that presidential address would be a 'litmus test' for his efforts for reconciliation between the two parties, the PML-N source said.
Contrary to a perception that things have been settled between the PPP and the PML-N, the fact is that it was just a beginning of a shift towards normalcy in bilateral relations despite efforts by Gilani, he added.
Another PML-N leader said his party wanted to reverse all the actions taken by former president Pervez Musharraf.
"We want to reverse all the things except an increase in women's representation, voter age limit and a few other issues. But we don't agree with the constitutional package drafted by the PPP," he said.