Boris Johnson will unveil mini Cabinet reshuffle today after Downing Street exodus

Boris Johnson will unveil a mini reshuffle of his ministers today after an exodus of five top Downing Street staff.

The Prime Minister made serving Cabinet minister Steve Barclay his Chief of Staff on Saturday after No10 was hurled into chaos.

But Mr Barclay, an MP and Chancellor of the Duchy of Lancaster, is now expected to step back from some of his responsibilities after previous Chiefs of Staff said he could not do three jobs at once.

Reports also suggested Chief Whip Mark Spencer would be shunted aside to become Commons Leader after the Prime Minister lost control of unruly backbenchers.

Current Commons Leader Jacob Rees-Mogg would become a "minister without portfolio", possibly overseeing Brexit, while a new Cabinet Office minister would help Mr Barclay with his multiple jobs, it was reported.

The Prime Minister made serving Cabinet minister Steve Barclay, pictured, his Chief of Staff (Getty Images)

New ministers were expected to walk up Downing Street, with a spokesman confirming: “There will be a small number of changes to be announced this afternoon.”

The PM's spokesman added: “It’s a small level of ministerial changes. These are the appointments we’ve talked about before, about the need to share portfolios and you’ll see some changes there.

“You can expect ministerial level changes. I’m not going to go guiding on Cabinet and things like that.”

Asked if any ministers have left the government, the spokesman replied at noon: “No”.

Asked if the PM had confidence in his Chief Whip he replied: “Yes”.

Reports had claimed Jacob Rees-Mogg could be made responsible for Brexit (PA)

Policy chief Munira Mirza, one of the PM’s longest-serving aides and one of the five women he says shaped his life, quit in disgust last week.

She blasted the Prime Minister for falsely claiming Keir Starmer failed to prosecute the paedophile Jimmy Savile.

Three more aides followed her out the door - Director of Communications Jack Doyle, Principle Private Secretary Martin Reynolds, and Chief of Staff Dan Rosenfield.

No10 allies claimed those three were part of a planned clearout, as Mr Reynolds had invited staff to a BYOB lockdown bash in May 2020.

Then a fifth aide's resignation emerged on Friday, with Elena Narozanski, an £80k Special Advisor to the Prime Minister and member of his policy unit, following her ally Ms Mirza out the door.

But the PM is still engulfed by a row over his Savile slur after it was repeated by a mob shouting at Keir Starmer outside Parliament last night.