"The Palestinian resistance insists on the accomplishment of its demands, including the creation of a port and an airport in Gaza and the reconstruction of the strip," a senior leader of the Qassam Brigades, told Anadolu Agency on Wednesday.
"The final say will be for the battlefield if our demands are not met," he said.
Palestinian and Israeli delegations are currently in the Egyptian capital Cairo to negotiate a long-term ceasefire in the Gaza Strip.
The indirect negotiations were made possible by an Egypt-brokered three-day ceasefire that started on the Gaza Strip on Tuesday.
The Qassam leader, however, however, declined to outline the measures that will be taken if the Cairo talks failed to bear fruit.
Hamas officials could not be reached for comment.
Earlier in the day, Egyptian Foreign Minister Sameh Shoukri expressed hope for extending the ceasefire between Gaza-based Palestinian factions and Israel.
At least 1867 Palestinians have been killed, more than 9470 injured and thousands of homes destroyed in relentless Israeli attacks on the Gaza Strip since July 7, according to the Palestinian Health Ministry.
Around 67 Israelis, including 64 troops and three civilians, have also been killed.