Gordon Brown will share a platform with his one-time leadership rival John McDonnell at this week's virtual Labour party conference, it has been revealed.
The former prime minister will join the ex-shadow chancellor to call for full employment across the UK.
Left-winger McDonnell served as Jeremy Corbyn's effective deputy before quitting in the wake of Labour's disastrous performance at last year's general election.
He was the only MP to challenge Brown for leadership of the party in 2007 when Tony Blair stood down, but failed to secure enough nominations to make it on to the ballot paper.
McDonnell is now supporting Brown's initiative, the Alliance for Full Employment, which is also backed by Welsh First Minister Mark Drakeford and Manchester mayor Andy Burnham.
With unemployment expected to rocket when the UK Government’s furlough scheme ends in October, the Labour grandees are promoting economic recovery policies to prevent redundancies.
McDonnell said: “With the existing furlough coming to an end Rishi Sunak has been forced into coming up with some further support scheme.
"This is typical Sunak - hesitant, indecisive and only acceding to the inevitable when put under immense pressure.
"I fear that he will follow his past practice and the measures he brings forward will be too little and too late for many who have already lost their jobs or are about to.
"Plus the government has no long term plan to create the economy we need not just to take us through the immediate challenges of the pandemic but the increasingly imminent threat of climate catastrophe.
"Gordon Brown’s initiative provides the basis for addressing the current and long term issues our economy faces.”
Brown said: “I want everybody to know that we have got to come together to fight unemployment and we must do so quickly.”
The virtual Labour conference - branded Labour Connected - will run from September 19-22 and all events will be streamed online.