Israel is considering an extension of the 42-day truce in Gaza as it seeks to bring home the remaining 63 hostages while putting off agreement on the future of the enclave for now, Israeli officials said.

The initial phase of the ceasefire deal, launched with the backing of the United States and the help of Egyptian and Qatari mediators on January 19, is due to end on Saturday and it remains unclear what will follow.

“We are being very cautious,” Israeli Deputy Foreign Minister Sharren Haskel told reporters in Jerusalem when asked whether the truce might be extended without the start of talks on a second phase which would include difficult issues such as a final end to the war and the future governance of Gaza.

“There wasn’t a particular agreement on that, but it might be a possibility,” she said.

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“We didn’t close the option of continuing the current ceasefire, but in return for our hostages, and they have to be returned safely.”

If no agreement is reached by Friday, officials expect either a return to fighting or a freeze in the current situation in which the truce would continue but hostages would not return and Israel may block the entry of aid into Gaza.

Two officials who have been involved in the ceasefire process told Reuters that Israel and the Hamas have not engaged in negotiations to finalise an agreement over phase two of the ceasefire which will have to bridge wide gaps between the two sides to be concluded.

“I think it’s unrealistic to see something like that forming within a few days,” Haskel said.

“This is something that needs to be discussed in depth. This is going to take time.”

The deal, which included the release of 33 Israeli hostages in return for some 2,000 Palestinian prisoners and detainees held in Israeli jails and the withdrawal of Israeli troops from some of their positions in Gaza, has survived numerous hiccups.

So far, 29 Israeli hostages - plus five Thais - have been released in exchange for hundreds of Palestinian prisoners and detainees, with the bodies of four more hostages, initially due to be handed over on Thursday, still to come.

There is now a standoff over the release of more than 600 Palestinians, which Israel has delayed, accusing Hamas of breaching the agreement by making a public show of the handover of Israeli hostages in Gaza.

Hamas official Basem Naim said progress could not be made while the prisoners were still being held but that Hamas was committed to a permanent ceasefire and the full withdrawal of Israeli forces.