Health Secretary Matt Hancock conceded that secondary schools in England may not fully reopen until later than September despite saying coronavirus is "in retreat" across the UK.
Boris Johnson will speak with his Cabinet on Tuesday morning before Education Secretary Gavin Williamson delivers a statement to Parliament on the wider reopening of schools.
Mr Hancock said at the Downing Street briefing that it was still "our current working plan" that secondary schools in England will not open until September "at the earliest".
The Department of Education said it remained the "ambition" for all primary school children to return before the summer holidays, but did not deny reports Mr Williamson will accept this desire may not be fulfilled.