Johnson, 55, was admitted to St Thomas' Hospital, across the River Thames from Parliament, late on Sunday after suffering symptoms including fever and cough for more than 10 days. She also experienced coronavirus symptoms and is recovering separately from the PM. "We, in Indonesia, wish you a speedy recovery and best wishes", he tweeted in reply to Johnson's tweet on Monday.
The acting leader of the government - although not in a constitutional sense a temporary Prime Minister or even Deputy Prime Minister - Mr Raab also confirmed that Mr Johnson hadn't been placed on a ventilator, a sign of a critical stage of illness with the virus.
His transfer to intensive care is unprecedented for a prime minister during a national emergency.
Johnson's cabinet has repeatedly downplayed the prime minister's condition since his initial diagnosis and throughout his hospitalization.
Johnson announced on March 27 that he had coronavirus and went into self-isolation in a flat above his Downing Street office.
"I've got total confidence in the arrangements that the prime minister has put in place so that I can discharge responsibility for him, deputizing for him while he's out of action, and obviously we hope that will be for a very limited period of time", Raab said.
Before that he had been a junior local government minister under Theresa May.
The Queen has also released a statement in support of healthcare workers worldwide during the coronavirus pandemic.
"He's pretty stoic and can be a bit bloody-minded about that kind of thing", Walden told the BBC.
An outpouring of well-wishes from world leaders followed news of Johnson's admission to intensive care. "He's been really something very special - strong, resolute, doesn't quit, doesn't give up".
The US president said on Monday that he contacted four companies and asked two "to contact London immediately" to offer their products to help treat the British PM.
Sir Patrick Vallance said it was "possible that we're beginning to see. the curve flattening".
French President Emmanuel Macron tweeted he was sending support to Johnson, his family and "the British people at this hard time". I know that from facing him on the tennis court.
"We wish him a speedy recovery at this hard time. W".
The virus causes mild to moderate symptoms in most people, but for some, especially older adults and the infirm, it can cause pneumonia and lead to death.
"All of our thoughts and prayers are with the prime minister at this time, with Carrie, and with his whole family", Raab said.
In the meantime, deaths within the United Kingdom yesterday reached 6,159 with 758 individuals dying in England alone - Britain's deadliest day but.