Space weather and the orientation of the spacecraft create uncertainty about the timing of Tiangong-1's re-entry.
In 2016, China confirmed that it had lost the ability to control the behaviour of the satellite and therefore, can not confirm where will it crash.
As Tiangong-1 plunges into Earth's atmosphere, it will ignite and break into large chunks before crumbling further.
While much of the spacecraft would likely burn up in the atmosphere, ESA experts say portions could survive and reach Earth's surface.
But space agencies don't know exactly when or where that will happen. China's space agency says the window could extend to next Wednesday.
"In the history of spaceflight, no casualties due to falling space debris have ever been confirmed", ESA said in a blog post on its website. It is reported to have a mass similar to that of other satellites that make uncontrolled reentries a couple of times a month without anyone noticing it.
Markus Dolensky, the technical director at the International Centre for Radio Astronomy Research in Australia, said if skies were clear witnesses may potentially see a "series of fireballs streaking across the sky".
Trackers have been following the space station's descent over the course of a number of weeks, gathering radar images and coming up with estimates for when it'll come down.
"When considering the worst-case location the probability that a specific person will be struck by Tiangong-1 debris is about one million times smaller than the odds of winning the Powerball jackpot", states the report.
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