America’s former top military officer said he expected it would happen relatively quickly so that experts could begin analysing its equipment.
Fighter jets brought the craft down over US territorial waters on Saturday and debris is spread over a wide area.
The US believes the balloon was monitoring sensitive military sites.
Its discovery set off a diplomatic crisis, with US Secretary of State Antony Blinken immediately calling off this weekend’s trip to China.
The Chinese authorities denied it was used for spying and insisted it was a weather ship blown astray.
Admiral Mike Mullen, former chair of the US Joint Chiefs of Staff, said on Sunday he thought the Chinese military might have launched the balloon intentionally to disrupt Mr Blinken’s trip to China. His visit would have been the first such high level US-China meeting there in years.
Adm Mullen rejected China’s suggestion it might have blown off course, saying it was manoeuvrable because “it has propellers on it”.
“This was not an accident. This was deliberate. It was intelligence,” he added.
Republican politicians. meanwhile, accused US President Joe Biden of a dereliction of duty for allowing the balloon to traverse the country unhindered.
Marco Rubio, vice-chair of the Senate intelligence committee, told CNN it was a “brazen effort” by China to embarrass the president ahead of his State of the Union address on Tuesday.
Brenda Bethune, the mayor of Myrtle Beach which is near to where the object was shot down, said: “I do have concerns about how the federal government can allow a foreign adversary to fly uninterrupted from Montana to our doorstep.”
She said she hoped the government would explain how this happened and how they will prevent it from happening again.
The high-altitude balloon – thought to be the size of three buses – was shot out of the sky by a Sidewinder air-to-air missile fired from an F-22 jet fighter. It came down about six nautical miles off the US coast at 14:39 EST (19:39 GMT) on Saturday.
US TV networks broadcast the moment the missile struck, with the giant white object falling to the sea after a small explosion.
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