The British government is banning all non-essential travel outside London and parts of the south-east of England
The regions are going into Tier 4 public health restrictions to try and stop the spread of the new strain of COVID-19 there.
Last month, four in ten Irish people living in the UK said they planned to come home for Christmas.
But at a press conference this afternoon, Boris Johnson told reporters he's banning travel out of the worst-hit areas.
He also announced that the planned five-day easing of restrictions over the festive period will now be limited to a single day.
In a dramatic move, prompted by fears over a new strain of coronavirus, all those areas currently in Tier 3 in the South East - including London - will move to the new Tier 4 on Sunday.
The Tier 4 measures will see all non-essential shops, gyms, and hairdressers close, with people ordered to stay home apart from limited exceptions such as work - if people cannot work from home - education, childcare and exercise.
People in Tier 4 areas will no longer be allowed to form "Christmas bubbles" with other households.
