Talks between the UN special envoy for Syria and government representatives tentatively planned for Monday 11:00 am in Geneva have been "rescheduled" to allow talks with the opposition first, the UN said.

Khawla Mattar, spokeswoman for special envoy Staffan de Mistura, told AFP there was "the need to meet" with opposition first, and that a meeting with the government would happen "maybe another day."

Discussions with the opposition umbrella group the High Negotiations Committee (HNC) were still expected to take place at the UN's European headquarters at 5:00 pm, the UN said.

The HNC, which only reluctantly showed up late Saturday and held informal talks with de Mistura on Sunday in a Geneva hotel, is hesitating about entering formal indirect talks envisioned under a November roadmap agreed by outside powers.