A UN plane will evacuate 50 wounded Houthi militants from Yemen's rebel-held capital Sana'a on Monday as a "confidence building measure" ahead of planned peace talks in Sweden, a Saudi-led military coalition said.

"A UN chartered plane will arrive at Sana'a international airport Monday to evacuate 50 wounded combatants... three Yemeni doctors and a UN doctor, from Sana'a to Muscat," a coalition spokesman said in a statement carried by the official Saudi Press Agency.

The fate of wounded rebels had been a stumbling block to the start of a previous round of aborted peace talks in September.

The coalition agreed to facilitate the medical evacuations at the request of Martin Griffiths, the UN envoy, for "humanitarian reasons" and as a "confidence building measure", the spokesman added.

Houthi rebels on Thursday said they will attend UN-brokered peace talks in Sweden this week if guarantees to ensure they can leave home and return back are maintained.