The ban could include components already built into the networks, requiring operators to remove and replace them and is part of a broader re-evaluation of its relationship with top trade partner China.
Critics of Huawei and ZTE say that their close links to China’s security services mean that embedding them in the ubiquitous mobile networks of the future could give Chinese spies and even saboteurs access to swathes of essential infrastructure. The critics have yet to provide evidence for these claims which appear to be a lot harder to find that proof that the German government became rather too dependent on that nice Mr Putin's gas.
Huawei, ZTE and the Chinese government reject these claims, saying that they are motivated by a protectionist desire to support non-Chinese rivals.
A Huawei spokesperson said the company had a "very good security record" during its 20 years of delivering its technology to Germany and the rest of the world. ZTE did not immediately reply to a request for comment.
Germany passed an IT security law in 2021 setting high hurdles for makers of telecommunications equipment for next-generation networks, but stopping short of banning Huawei and ZTE as some other countries have done.
A recent report shows that Germany was more dependent on Huawei for its 5G radio access network equipment (RAN) than in its 4G network, even though operators have avoided using the firm's technology for the core networks.
Zeit Online said the government's cybersecurity agency and interior ministry had for months been checking if there were components in the growing 5G networks that could put German security at risk.
The survey had not officially been ended, but the result was already clear, the paper said, citing government sources. The government would ban operators from using certain controlling elements from Huawei and ZTE in 5G networks.