Jersey's borders will remain open - but all passengers arriving into the island from the UK will be treated as 'red' under travel restrictions.
It means passengers arriving from any part of the UK must be tested three times and isolate until their day 10 test returns a negative result.
The measures came into effect at midnight on (Tuesday 22 December) and will be in place for at least a week.
They will also apply to people who are travelling to the UK on a day trip.
The government had faced calls from Reform Jersey politicians to close the borders to non-essential travel and step up isolation requirements for inbound passengers. Party leader Senator Sam Mézec accused Chief Minister Senator John Le Fondré of 'failing' in his strategy.
However, the Chief Minister says that the borders will remain open.
It comes following the news that a new strain of coronavirus called VUI 202012/01, has emerged in England - leading to a rise in cases in London and the South East.
The STAC committee is currently working to establish if that strain is currently active in Jersey. Samples have been sent to Public Health England for analysis.