Instead, the rebels stuck to their demands for repositioning of Syrian government forces before any handover.
The 21 Filipino peacekeepers were seized on Wednesday near the Syrian village of Jamlah, near the Israeli-controlled Golan Heights, where the UN force has patrolled a ceasefire line between Israel and Syria for nearly four decades.
Philippine Department of Foreign Affairs spokesman Raul Hernandez said the rebels had been expected to free the peacekeepers early today.
"I don't know exactly know what happened, why the expected release did not happen, but the demand is still there" for the Syrian forces to pull back, he said in Manila.
Last week, rebels from the group holding the peacekeepers took several Syrian army checkpoints in the area.
However, there are still government positions nearby and the rebels are apparently holding the peacekeepers as human shields.