US Commerce Secretary Wilbur Ross has confirmed that the ban on Chinese technology firm Huawei will not come into force for another 90 days.
The US blacklisted the company in May because of national security concerns.
Huawei was then granted a temporary permit to ease the transition, which was due to expire August 19.
However, Mr. Ross said a further 46 Huawei affiliates would now be added to the US Entity List, a blacklist of firms with which the US will not trade.
The reprieve was designed to allow companies such as Google to trade with Huawei while adjusting to the restrictions.