Welsh ministers are in emergency talks to discuss "serious concerns" over the spread of a new strain of Covid-19, APA reports citing BBC.
First Minister Mark Drakeford took part in a call with representatives of the UK's devolved nations after a surge in cases.
Prime Minister Boris Johnson is due to give a press conference at 16:00 GMT on Saturday in response to rising case rates in parts of England.
It comes as rules are due to be relaxed over the Christmas break.
England's chief medical officer Prof Chris Whitty said government advisers "consider the new strain can spread more quickly".
Cases of the new strain have been confirmed in Wales..
The BBC understands Mr Johnson is about to announce tougher measures for London and south-east England.
In a tweet, Mr Drakeford said: "I attended a four nation call earlier today to discuss serious concerns over the spread of a new Covid variant.
"I will chair a meeting of the Welsh Government Cabinet at 2pm today."