The detentions come amid the Chinese tech company coming under western scrutiny for being linked to China's government and having equipment which could contain "backdoors" for use by government spies.
"The Chinese individual is a businessman working for an important telecommunications firm", Maciej Wasik, deputy head of Poland's special services, said. The Chinese national was a sales director, though the Polish national's role is unclear.
Both people "carried out espionage activities against Poland", a Polish government official told the AP.
NPR reports that this isn't a case of industrial espionage, either.
Poland's public TV channel TVP reports that the Chinese national is a sales director at Chinese telecoms firm Huawei's Polish branch.
Polish public broadcaster TVP said the Polish suspect, identified only as Piotr D, was a former high-ranking officer in the Internal Security Agency.
Last month, Huawei's CFO Wang Mei Zhou was arrested in Vancouver Canada for allegedly allowing Huawei to violate a USA sanction against Iran. Huawei CFO Meng Wanzhou was detained in Canada at the request of the USA government over charges that she's violated sanctions against Iran.
In what was widely seen as retaliation by Beijing, two Canadians - a former diplomat and a business consultant - were detained in China on the grounds of national security.
"Europe is either dependent on China or the U.S.".
Just how far did this go in Poland?
Last spring, Huawei surpassed Samsung to become Poland's top smartphone supplier with more than a third of the market, as China.org reported. If the company uses its products to gain intel for Beijing, they have all sorts of sources available.
The Chinese embassy in Poland has also asked Warsaw to "effectively ensure the legitimate rights and interests, and humanitarian and safe treatment of the person involved". Some of our allies might want to consider whether to heed the earlier warnings from United States intelligence.
In addition to this, Huawei have come under fire from authorities in Norway, Germany, the USA, the UK, Australia and New Zealand, with several countries outright banning the use of their devices or equipment used in 5G mobile networks.
Huawei, on the other hand, said that it's aware of the situation but denies comments for now.
Scott Bradley, Canadian vice-president of corporate affairs for Huawei, is pictured outside a bail hearing for Huawei's chief financial officer Meng Wanzhou in Vancouver, Monday, Dec. 10, 2018.