The announcement comes shortly after Pakistan Muslim League-Nawaz President Shehbaz Sharif and PPP co-chairman Asif Ali Zardari briefly met during the National Assembly session.
After the session, former president Zardari said that there was no update on the issue of APC, while Shehbaz Sharif said that he will make a statement on the issue after consultation.
Sources on Sunday had informed that Fazl failed to convince former prime minister Nawaz Sharif to attend the APC.
Meanwhile, the JUI-F chief had said that Nawaz will make a decision after consulting PML-N president Shehbaz Sharif.
Earlier, a day earlier, PPP co-chairman Asif Ali Zardari said they have agreed to attend the APC hosted by Maulana Fazl.
The main agenda to call multi-party conference is to form a grand opposition alliance against Prime Minister Imran Khan-led federal government.