Andy Burnham is leaving the shadow cabinet to focus on his campaign to become the next mayor of Greater Manchester.
The shadow home secretary and former leadership contender told the Labour Party conference: "It is time for me to turn my full focus to Greater Manchester.
"That's why I can tell you all first today that I have asked Jeremy to plan a new shadow cabinet without me, although I will of course stay until it is in place.
"I have given my all to this Party and always put its interests above those of factions and personalities. And I have given exactly the same loyalty to all four of the Labour leaders I have served."
The mayoral election will take place in 2017 at the same time as scheduled local elections in May.
Sam Allardyce says "entrapment has won" after he lost his job following a newspaper investigation.
The Football Association terminated his contract on Tuesday after revelations made in The Telegraph.
Speaking outside his home the day after he left the England manager's job, the former Bolton boss explained he was off on holiday to reflect on what had happened.
Gordon Brown has said Shimon Peres will be mourned around the world.
The former prime minister said: "Shimon Peres will be remembered as a peacemaker - mourned on every continent by men and women committed to ending war.
"He understood the importance of negotiation because he understood the cost of war. He was not an idealist for peace out of vision alone but because he had lived through times of conflict.
"His personal journey through life challenges us all to think how best we can promote peace and reconciliation."