London Councils, a cross-party organisation which represents all 32 boroughs and the City of London, said the English capital was being placed on the national Covid-19 watchlist.
The list is divided between areas where intervention is required via local lockdown restrictions and areas of concern that are closely monitored.
London Councils said no additional measures were being taken in the city but that its entry on the list was a “stark reminder that now is time for all Londoners to pull together and take action to keep themselves, their families and their communities safe, and to ensure that London’s economy is protected”.
A statement said: “There are no additional measures at this stage but it is welcome that that the city’s testing capacity is boosted so that Londoners have timely access to Covid-19 tests and the Government must ensure that this is sustained from now on. If Londoners have Covid-19 symptoms they should apply for a test at nhs/coronavirus or call 119.
“London boroughs are working with their communities, business and the police to engage, educate, explain and, if necessary, enforce the new restrictions and regulations, and the Government must ensure that it funds these so resources do not need to be drawn from other services.
“We ask all Londoners to work together and abide by the national restrictions announced on Tuesday.”