The office of Israeli Prime Minister Benjamin Netanyahu said the Red Cross turned over a body it received from militants.
Islamic Jihad, which is allied with Hamas and also seized hostages during the October 7, 2023 attack that precipitated the Gaza Strip war, said the body was recovered in the city of Khan Younis, in the enclave's south.
Since the ceasefire between Israel and Hamas began on October 10, the remains of 24 hostages have been returned to Israel.
If the latest body turned over is confirmed by Israel to be a hostage, there will still be three more in the Gaza Strip that need to be recovered and handed over.
Israel has been releasing 15 Palestinian bodies for the remains of each hostage as part of the ceasefire agreement.
The Gazan health ministry said the total number of remains received so far is 315.
Hamas has said recovering bodies is complicated by the widespread devastation in the Gaza Strip.
Israel has pushed to speed up the returns and in certain cases has said the remains were not those of hostages.
The militants on Thursday did not specify the identity of the body that will be examined by the Abu Kabir Forensic Institute in Tel Aviv.
Under a ceasefire deal, Hamas returned 20 living hostages to Israel on October 13.
The further exchanges of the dead are the central component of the initial phase of the US-brokered agreement which requires Hamas return all hostage remains as quickly as possible.
The exchanges have gone ahead even as Israel and Hamas have accused each other of violating other terms of the deal.
Israeli officials have accused Hamas of handing over partial remains in some instances and staging the discovery of bodies in others.
Hamas has accused Israel of opening fire at civilians and restricting the flow of humanitarian aid into the territory.
The number of casualties has dropped since the ceasefire took effect but officials in the strip have continued to report deaths from strikes, while Israel has said that soldiers have also been killed in militant attacks.
Gazan health officials have said identifying the remains handed over by Israel is complicated by a lack of DNA testing kits.
The ceasefire deal will not move to subsequent phases until all the remains of Israeli hostages are returned.
The next parts of the 20-point plan call for creating an international stabilisation force.
Its makeup has not been finalised but diplomats are working to define its role, persuade Arab countries to take part and win wider international support.
The agreement aims to wind down the war that was triggered by the Hamas-led attack on southern Israel that killed about 1200 people and took 251 hostage.
Israel responded with a sweeping military offensive that has killed more than 69,100 Palestinians in the Gaza Strip, according to the Gazan health ministry.
with EFE and AP
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