National League for Democracy executive Win Thein told reporters that it will nominate a member of the Burman ethnic majority, Win Myint, for lower house speaker and an ethnic Kachin, Ti Khun Myat, for his deputy.
It will propose a Karen, Win Khaing Than, for speaker of the upper house, and an Arakanese, Aye Thar Aung, for his deputy.
In what is seen as another gesture toward unity and reconciliation, the proposed deputies come from other parties.
Ethnic conflict has bedeviled Myanmar for decades, with minority groups fielding guerrilla armies in a bid for greater autonomy.
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Suu Kyi is constitutionally barred from taking the presidency, and has vowed to rule from behind the scenes through a proxy. She has not announced who her party will nominate for president.
Despite its landslide victory, the NLD in practice will have to share power with the military, for which the constitution reserves 25 per cent of the seats in parliament.
The NLD easily won last November's general election, allowing it to unseat the USDP and replace President Thein Sein, who today gave what is likely to be his last speech in parliament, reviewing his government's accomplishments. Thein Sein, a former army general, led a transitional administration after almost a half century of military rule.
The USDP won a 2010 election in which the NLD refused to participate, protesting that it was held under unfair conditions. After several changes in the election law, the NLD contested several dozen by-elections in 2012, winning virtually all of them.