The “urgent debate” on a resolution proposed by the UK is scheduled to open at 3pm local time, a spokesman for the Geneva-based council said in a statement.
The British draft reiterates calls for immediate humanitarian access to Eastern Ghouta, where a controversial truce unilaterally declared by Syrian ally Russia has failed to produce a breakthrough.
The draft resolution also calls on war crimes investigators from the UN-backed Commission of Inquiry for Syria to conduct an investigation into alleged atrocities in the area.
Russia does not currently hold a seat on the rights council, which has 47 members rotating on three-year terms, but it could muster its allies to push back against the British proposal.
The British draft also calls for the full and immediate implementation of Security Council resolution passed last weekend which foresees a 30-day ceasefire across Syria that has so far not been put into effect.