The Labour leader admitted on Saturday to making mistakes and disclosed that he would be making a peace offer to MPs in an attempt to persuade his critics to return to the shadow cabinet.

However, Mr Johnson, the former Home Secretary, condemned Mr Corbyn as “useless”, “incompetent” and “incapable” of running a political party, and called on rebels not to give up their efforts to oust him.

In an interview with The Times, he said Mr Corbyn’s hard-Left backers had taken over the party but did not care whether Labour was capable of winning an election.

"They are not interested in getting into power because victory is a bourgeois concept,” Mr Johnson said.

"They've captured the castle," he said. "Just as the [Left-wing] Campaign group carried on year after year undermining whoever was the Labour leader, so we've got to do the same. We've got to recapture this party again otherwise it's dead and finished and gone."