Sir Rod Stewart has sensationally attacked Gregg Wallace after it was reported the presenter would be stepping down from his role on MasterChef.

Posting on his Instagram account, Stewart said: "So Greg Wallace gets fired from Master Chef. Good riddance Wallace...

"You humiliated my wife when she was on the show, but you had that bit cut out didn't you? You're a tubby, bald-headed, ill-mannered bully. 

"Karma got ya.

"Sir Rod Stewart."

Wallace will step down from the show while complaints made to the BBC from individuals about historical allegations of misconduct are investigated.

Wallace, 60, is “committed to fully cooperating throughout the process”, a statement from Banijay UK to the PA news agency said.

Gregg Wallace to step away from MasterChef amid misconduct allegations

The statement said: “This week the BBC received complaints from individuals in relation to historical allegations of misconduct while working with presenter Gregg Wallace on one of our shows.

“Whilst these complainants have not raised the allegations directly with our show producers or parent company Banijay UK, we feel that it is appropriate to conduct an immediate, external review to fully and impartially investigate.

“While this review is underway, Gregg Wallace will be stepping away from his role on MasterChef and is committed to fully cooperating throughout the process.

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Gregg Wallace to step down from presenting BBC's MasterChef

“Banijay UK’s duty of care to staff is always a priority and our expectations regarding behaviour are made clear to both cast and crew on all productions, with multiple ways of raising concerns, including anonymously, clearly promoted on set.

“Whilst these are historical allegations, incidences brought to our attention where these expectations are not met, are thoroughly investigated and addressed appropriately.”

The statement added: “If anyone would like to talk to us or raise any issues or concerns, then they can contact speakup@banijayuk.com in confidence.”