British Prime Minister Boris Johnson said he owes his life to the National Health Service staff who treated him for Covid-19, ahead of figures on Sunday in which the United Kingdom (UK) is expected to surpass 10,000 coronavirus related deaths.

“I can’t thank them enough,” Johnson said in his first public statement since he was moved out of intensive care Thursday night at St. Thomas’ Hospital in London. “I owe them my life.”

Johnson, 55, was diagnosed over two weeks ago, becoming the first world leader confirmed to have the illness. His coronavirus symptoms at first were said to have been mild, including a cough and a fever, and he was working from home during the first few days.

But he was admitted to St Thomas’ on April 5 after his condition worsened and he was transferred the following day to its intensive care unit, where he received oxygen but was not put onto a ventilator. He spent three nights there before moving back to a regular hospital ward.

While he convalesces, Johnson has asked UK Foreign Secretary Dominic Raab to handle the nation’s response to the pandemic that has infected at least 1.78 million worldwide and killed 109,000 people. Experts say those numbers seriously understate the impact of the pandemic, due to limited testing and different ways of counting the dead.

Johnson’s Conservative government has come under fire for its slow response to confronting the pandemic, as well as a lack of personal protective equipment for medical workers and the slow rollout of a coronavirus testing program. One senior medical official lacerated the government for not acting quickly enough.

Britain has been in effective lockdown since March 23 and the government is set to extend the restrictions sometime next week.

Figures later on Sunday are expected to show that over 10,000 people in the UK have died after testing positive for coronavirus. That would make Britain the fourth European country after Italy, Spain and France to reach that grim milestone, even with its limited testing.

On Saturday, Britain reported 917 new coronavirus related deaths, taking the total number of people who have died in the hospital with the virus to 9,875.

With Britain’s death toll increasing at such a rapid daily pace, and the virus death tolls in Italy and Spain on a downward slope, there are growing fears that the UK will end up being the country with the most virus deaths in Europe. The continent has had almost 74,000 reported coronavirus deaths.

Last week, the British government’s chief scientific adviser, Patrick Vallance, warned that the daily number of deaths would likely increase for a couple more weeks.

Britain’s business secretary, Alok Sharma, refused to be drawn in on whether the UK will end up with the highest death toll in Europe.

“We are at different trajectories,” he said told the BBC. “We are starting to see these measures work.”