The Telegraph said Johnson's instructions to officials to draft plans for this scenario had come about due to the coronavirus pandemic.
In January, the UK announced that it would give Huawei a limited role in the country's 5G networks, giving the company a chance to bid for supplying up to 35% of equipment for non-core parts of the network.
The Telegraph said Johnson's decision was taken due to a growing backlash among his party's MPs against Chinese investment in Britain after the COVID-19 outbreak.
That decision was not announced publicly, but leaked to one newspaper. Three telcos have already rolled out 5G networks, and all have used Huawei gear in the non-core parts of the network in keeping with the interim decision.
But China's actions during the pandemic appear to have sparked a rethink in the UK about Huawei's involvement in its 5G networks.
Additionally, there has been no let-up in pressure from the US for London to fall in line and block Huawei altogether.
Johnson's trip to the US is to participate in the G7 summit and he is expected to hold trade talks with the US.