The small craft, taken around 90 kilometers northwest from Subic Bay in the Philippines last week, will be handed over to the crew of a US warship in the vicinity of Scarborough Shoal.
"A US destroyer will be there," the official told AFP today, speaking on condition of anonymity.
The handover was slated to occur sometime on December 20, though details of how it would happen were still being worked out.
The Pentagon says the marine probe is a commercial craft that gathers unclassified data that can be used to help submarines navigate and determine sonar ranges in murky waters.
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Last week's seizure was the first time China had "brazenly stolen a piece of US government property," the official said.
China said the drone had been snatched since it might pose a safety hazard to other vessels.
It also said it "strongly opposed" US reconnaissance activities and had asked Washington to stop them.
The incident unfolded when a Chinese Dalang-III class submarine rescue ship stopped within 457.2 meters of the civilian-crewed USNS Bowditch and snatched one of a pair of probes. The Americans safely hoisted the other one back onto their ship.
China's seizure of the bright-yellow, unmanned underwater vehicle has prompted sharp words between Washington and Beijing, with US diplomats protesting the "unlawful" incident.
President-elect Donald Trump further ratcheted up tensions by accusing China of theft.
"China steals United States Navy research drone in international waters -- rips it out of water and takes it to China in unpresidented act," he wrote in a misspelled tweet he later corrected.