The gathering, which will take place in an yet-to-be announced location on Sunday, will involve politicians, NGOs and "all concerned with the issue" the official told AFP, without giving further details.
Last Friday, Malaysia summoned the Myanmar ambassador while around 500 Malaysians and Rohingya marched through a heavy tropical downpour from a Kuala Lumpur mosque to Myanmar's embassy carrying banners denouncing the Rakhine "genocide."
Muslim-majority Malaysia's Cabinet also issued a statement last week condemning the violence, an unusually strong criticism against a fellow member of the 10-country Association of Southeast Asian Nations (ASEAN) which has a policy of non-interference in member states.
Chong Ja Ian, a political analyst from the National University of Singapore, said Najib's appearance at such a rally will be "odd."
"During last year's migrant crisis, there was criticism but it was oblique and not to this level," he said.
The discovery last year of human-trafficking camps -- and scores of nearby graves -- first in Thailand and then over the border in Malaysia caused shock and revulsion in Southeast Asia.
Bridget Welsh, a Malaysia politics expert with Turkey's Ipek University, said the planned gathering was "purely a political exercise" for Malaysian leaders.
"These leaders are desperately trying to show their Islamic credentials as they are losing moral legitimacy at home," she said.
Violence in Rakhine -- home to the stateless ethnic group loathed by many of Myanmar's Buddhist majority -- has surged in the last month after security forces poured into the area following a series of attacks on police posts blamed on local militants.
But Myanmar's new civilian government, led by Nobel Peace Prize winner Aung San Suu Kyi, has rejected the allegations.
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